Ethnic Hui Muslim cordyceps pickers clean their bowls at a base camp on a mountain in the Amne Machin range in China's western Qinghai province, June 7, 2019. Cordyceps pickers are hired by a local company to find and pick the Ophiocordyceps sinensis, a fungus believed to possess aphrodisiac and medicinal powers. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An ethnic Hui Muslim cordyceps picker cleans himself at a base camp on a mountain in the Amne Machin range in China's western Qinghai province, June 8, 2019. Cordyceps pickers are hired by a local company to find and pick the Ophiocordyceps sinensis, a fungus believed to possess aphrodisiac and medicinal powers. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An ethnic Hui Muslim cooks steamed bread for cordyceps pickers at a base camp on a mountain in the Amne Machin range in China's western Qinghai province, June 8, 2019. Cordyceps pickers are hired by a local company to find and pick the Ophiocordyceps sinensis, a fungus believed to possess aphrodisiac and medicinal powers. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Ma Junxiao, 49, an ethnic Hui Muslim farmer from remote western China, scans the ground to find cordyceps, a fungus believed to possess aphrodisiac and medicinal powers, on a mountain in the Amne Machin range in China's western Qinghai province, June 8, 2019. Ma has been picking cordyceps in Qinghai for the past 14 years. "The glaciers are gone, and so are the cordyceps," he said. REUTERS/Aly Song SEARCH "CHINA FUNGUS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A woman prepares food at a shop in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 3, 2018. Picture taken February 3, 2018. REUTERS/Michael Martina 

Men gather in a park in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 1, 2018. Picture taken February 1, 2018. REUTERS/Michael Martina 

Men wait for afternoon prayers to begin at a mosque in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 1, 2018. Picture taken February 1, 2018. REUTERS/Michael Martina 

Men talk on a street in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 3, 2018. Picture taken February 3, 2018. REUTERS/Michael Martina 

The sun rises over mountains and mosques in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 3, 2018. Picture taken February 3, 2018. REUTERS/Michael Martina 

A man and a woman walk through a neighbourhood in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 3, 2018. Picture taken February 3, 2018. REUTERS/Michael Martina 

A man sells food at a night market in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 1, 2018. Picture taken February 1, 2018. REUTERS/Michael Martina 

A man runs in front of a mosque at dusk as evening prayers are underway inside, in China's Linxia, Gansu province, home to a large population of ethnic minority Hui Muslims, February 2, 2018. Picture taken February 2, 2018. REUTERS/Michael Martina 

Halima watches as her husband Saleh serves food at the Chinese Muslim restaurant in Islamabad, Pakistan November 2, 2017. The couple had a catering business in Changji Hui Autonomous Prefecture of Xinjiang province in northwest China, but moved to Islamabad five months ago to open a restaurant to cater for the growing Chinese population working with CPEC projects in Pakistan. REUTERS/Caren Firouz 

Halima and her husband Saleh pose for a picture with a tray of freshly prepared dumplings in the kitchen of the Chinese Muslim restaurant in Islamabad, Pakistan November 2, 2017. The couple had a catering business in Changji Hui Autonomous Prefecture of Xinjiang province in northwest China, but moved to Islamabad five months ago to open a restaurant to cater for the growing Chinese population working with CPEC projects in Pakistan. REUTERS/Caren Firouz 

Halima and her husband Saleh pose for a picture in the dining room of the Chinese Muslim restaurant in Islamabad, Pakistan November 2, 2017. The couple had a catering business in Changji Hui Autonomous Prefecture of Xinjiang province in northwest China, but moved to Islamabad five months ago to open a restaurant to cater for the growing Chinese population working with CPEC projects in Pakistan. REUTERS/Caren Firouz 

Customers walk down stairs to the Chinese Muslim restaurant run by Halima and Saleh, in Islamabad, Pakistan November 2, 2017. The couple had a catering business in Changji Hui Autonomous Prefecture of Xinjiang province in northwest China, but moved to Islamabad five months ago to open a restaurant to cater for the growing Chinese population working with CPEC projects in Pakistan. REUTERS/Caren Firouz 

Halima speaks with a customer using a mobile phone translation app at the Chinese Muslim restaurant in Islamabad, Pakistan November 2, 2017. Halima and her husband Saleh had a catering business in Changji Hui Autonomous Prefecture of Xinjiang province in northwest China, but moved to Islamabad five months ago to open a restaurant to cater for the growing Chinese population working with CPEC projects in Pakistan. REUTERS/Caren Firouz 

Halima watches as her husband Saleh cooks at the Chinese Muslim restaurant in Islamabad, Pakistan November 2, 2017. The couple had a catering business in Changji Hui Autonomous Prefecture of Xinjiang province in northwest China, but moved to Islamabad five months ago to open a restaurant to cater for the growing Chinese population working with CPEC projects in Pakistan. REUTERS/Caren Firouz 

Believers pray while attending an evening mass prayer session to mark the holy fasting month of Ramadan, in the Masjid Al-Noor Mosque in Hanoi June 29, 2014. There are some 70 Muslim believers in Hanoi, of about 70 thousand in Vietnam that started their holy month of Ramadan from Sunday, deputy head of Hanoi Muslim Community Mohamed Khuong said. REUTERS/Kham (VIETNAM - Tags: RELIGION SOCIETY) 

A boy attends an evening mass prayer session to mark the holy fasting month of Ramadan, in the Masjid Al-Noor Mosque in Hanoi June 29, 2014. There are some 70 Muslim believers in Hanoi, of about 70 thousand in Vietnam that started their holy month of Ramadan from Sunday, deputy head of Hanoi Muslim Community Mohamed Khuong said. REUTERS/Kham (VIETNAM - Tags: RELIGION SOCIETY) 

Believers pray as a boy walks among them during an evening mass prayer session to mark the holy fasting month of Ramadan, in the Masjid Al-Noor Mosque in Hanoi June 29, 2014. There are some 70 Muslim believers in Hanoi, of about 70 thousand in Vietnam that started their holy month of Ramadan on Sunday, deputy head of Hanoi Muslim Community Mohamed Khuong said. REUTERS/Kham (VIETNAM - Tags: RELIGION SOCIETY) 

A woman displays peach blossom flowers for sale in front of a Muslim mosque in Hanoi January 31, 2011. Peach blossoms, believed to bring luck to families, are used for decoration during Tet, the Vietnamese traditional lunar new year, which will take place from February 2 to 6. REUTERS/Kham (VIETNAM - Tags: SOCIETY RELIGION) 

A Hui Chinese man prays in the 1000-year-old Niujie Mosque located in central Beijing September 25, 2009. The mosque is the oldest and largest in Beijing where hundreds of Chinese Muslims pray every day. The Chinese characters read: "ancient mosque". REUTERS/David Gray (CHINA RELIGION SOCIETY) 

A Hui Chinese man prepares to enter the 1000-year-old Niujie Mosque located in central Beijing September 25, 2009. The mosque is the oldest and largest in Beijing where hundreds of Chinese Muslims pray every day. REUTERS/David Gray (CHINA RELIGION SOCIETY) 

A Hui Chinese man prepares enters the 1000-year-old Niujie Mosque located in central Beijing September 25, 2009. The mosque is the oldest and largest in Beijing where hundreds of Chinese Muslims pray every day. REUTERS/David Gray (CHINA RELIGION SOCIETY) 

A Hui Chinese man prays in the 1000-year-old Niujie Mosque located in central Beijing September 25, 2009. The mosque is the oldest and largest in Beijing where hundreds of Chinese Muslims pray every day. REUTERS/David Gray (CHINA RELIGION SOCIETY) 

A Hui Chinese man prepares to pray in the 1000-year-old Niujie Mosque located in central Beijing September 25, 2009. The mosque is the oldest and largest in Beijing where hundreds of Chinese Muslims pray every day. REUTERS/David Gray (CHINA RELIGION SOCIETY) 

A boy of Ede ethnicity stands in front of rice grains at his house in Cu Kuin district, in Vietnam's central highland province of Daklak September 6, 2009. Asian rice prices were supported this week by government intervention and fresh demand for parboiled rice as buyers built up stocks before the end of the Muslim fasting month of Ramadan, traders said on Wednesday. In Vietnam, the second biggest exporter, prices remained steady this week despite thin demand as prices there, were supported by government buying, traders said. REUTERS/Kham (VIETNAM POLITICS AGRICULTURE BUSINESS) 

A delegate from the Chinese Hui minority group leaves after the closing ceremony of the National People's Congress (NPC) at the Great Hall of the People in Beijing March 13, 2009. REUTERS/Christina Hu (CHINA POLITICS SOCIETY) 

A Muslim from the Chinese Hui minority prays inside the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According to the mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority walks into the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

Muslims from the Chinese Hui minority walk into the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

A 76-year-old Muslim from the Chinese Hui minority walks into the Tongxin Great Mosque in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority speaks as he waits to pray inside theTongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26,2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority are rest in their dormitory in the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

Muslims from the Chinese Hui minority pray inside the Tongxin Great Mosque in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority prepares to pray in the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority pushes his scooter as he leaves the Tongxin Great Mosque in northwest China's Ningxia Hui Autonomous Region April 26, 2007. According to the mosque and local sources, the mosque, which was constructed in 1369 at the beginning of the Ming Dynasty with a traditional Chinese architectural style, is one of the oldest mosques in China and can hold more than 1,000 worshippers.
REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority waits to pray in the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

An 80-year-old Muslim from the Chinese Hui minority stands in the Tongxin Great Mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority prays inside a mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority prays inside a mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority hold containers as they wait to receive their lunch at a Muslim school in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. Chinese children have grown taller and heavier in recent years but their health is getting worse, a senior education official said on Wednesday, criticising pressure from parents and teachers to study. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority hold containers as they wait to receive their lunch at a Muslim school in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26, 2007. Chinese children have grown taller and heavier in recent years but their health is getting worse, a senior education official said on Wednesday, criticising pressure from parents and teachers to study. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority prays inside a mosque in Tongxin County in northwest China's Ningxia Hui Autonomous Region April 26,2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority walks past South Gate, also known as the "Small Tiananmen Gate", in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 25, 2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

A 10-year-old Muslim boy from the Chinese Hui minority is seen in a village on the outskirts of Yinchuan, capital of Ningxia Hui Autonomous Region, April 24,2007. With just over 20 million adherents, according to the government, there are as many Muslims in China as in Syria or Yemen, two predominantly Islamic countries. REUTERS/Jason Lee (CHINA) 

A Muslim from the Chinese Hui minority reads the Koran inside a mosque at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23, 2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority studies at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority studies at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority pray inside a mosque at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority study in a class at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority studies in a class at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority climb the staircase to their dormitory at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

Muslim students from the Chinese Hui minority study in a class at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority reads the Koran at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority plays table tennis after a class at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority reads the Koran at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A Muslim student from the Chinese Hui minority studies in a class at Ningxia Islamic College in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, April 23,2007. According to school and local sources, more than 300 students, including 82 girls, learn culture, Arabic language, Islam and history at the college, which was founded in 1989. REUTERS/Jason Lee (CHINA) 

A boy holds a traditional Vietnamese flag under an umbrella during the completion ceremony for the Chua Dong or Bronze Pagoda at the Yen Tu mountain, 150 km (93 miles) northeast of Hanoi January 30, 2007. The bronze pagoda, measuring 20 square metres (66 square ft) and made with nearly 70 tonnes of bronze, is cast on top of Yen Tu mountain at a height of 1,068 metres (3,504 ft). REUTERS/Kham (VIETNAM)