Theara Ouch, lead singer of Cambodian death-metal band Doch Chkae, consisting of orphans from a slum in the Cambodia's capital Phnom Penh, performs onstage as special guests at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany August 2, 2019. The band was founded in 2016 with the help of a Swiss social worker Timo Seibel and sings in the local language Khmer. REUTERS/Wolfgang Rattay 

Cambodian environmental activist Leng Ouch accepts his award at the 2017 Asia Game Changer Awards and Gala Dinner in Manhattan, New York, U.S. November 1, 2017. REUTERS/Amr Alfiky 

U.S. Assistant Secretary of State for Democracy, Human Rights and Labor Tom Malinowski (C) attends a meeting with Cambodian Secretary of State for Foreign Affairs and International Cooperation Ouch Borith at the Ministry of Foreign Affairs and International Cooperation in Phnom Penh July 18, 2016. REUTERS/Samrang Pring 

U.S. Assistant Secretary of State for Democracy, Human Rights and Labor Tom Malinowski (L) speaks during a meeting with Cambodian Secretary of State for Foreign Affairs and International Cooperation Ouch Borith at the Ministry of Foreign Affairs and International Cooperation in Phnom Penh July 18, 2016. REUTERS/Samrang Pring 

U.S. Assistant Secretary of State for Democracy, Human Rights, and Labor Tom Malinowski (L) attends a meeting with Cambodian Secretary of State for Foreign Affairs and International Cooperation Ouch Borith (2nd R) at the Ministry of Foreign Affairs and International Cooperation in Phnom Penh July 18, 2016. REUTERS/Samrang Pring 

A Palestinian man, who suffers from shoulder pains, receives bee -sting therapy at Rateb Samour's clinic in Gaza City April 11, 2016. Samour sees 250 patients a day, whose complaints range from hair loss to cerebral palsy and cancer. He is not a doctor and has never worked in a hospital. Samour inherited the skill of bee-sting therapy from his father. From 2003 the agricultural engineer dedicated all his time to study and develop the alternative-medicine treatment of apitherapy, which uses bee-related products from honey, propolis - or bee glue used to build hives - to venom. REUTERS/Suhaib Salem SEARCH "GAZA BEE" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES 

Palestinian girl Alya Al-Ghafari, who suffers from facial palsy, receives bee-sting therapy at Rateb Samour's clinic in Gaza City April 11, 2016. Samour sees 250 patients a day, whose complaints range from hair loss to cerebral palsy and cancer. He is not a doctor and has never worked in a hospital. Samour inherited the skill of bee-sting therapy from his father. From 2003 the agricultural engineer dedicated all his time to study and develop the alternative-medicine treatment of apitherapy, which uses bee-related products from honey, propolis - or bee glue used to build hives - to venom. REUTERS/Suhaib Salem SEARCH "GAZA BEE" FOR THIS STORY. SEARCH "THE WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Rugby Union - England v Wales - IRB Rugby World Cup 2015 Pool A - Twickenham Stadium, London, England - 26/9/15
Hallam Amos of Wales injured
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Supporters of Venezuela's President Nicolas Maduro clash with supporters of jailed opposition leader Leopoldo Lopez during a gathering outside the courthouse during his trial in Caracas September 10, 2015. REUTERS/Carlos Garcia Rawlins 

Supporters of Venezuela's President Nicolas Maduro clash with supporters of jailed opposition leader Leopoldo Lopez during a gathering outside the courthouse during his trial in Caracas September 10, 2015. REUTERS/Carlos Garcia Rawlins 

Supporters of Venezuela's President Nicolas Maduro clash with supporters of jailed opposition leader Leopoldo Lopez during a gathering outside the courthouse during his trial in Caracas September 10, 2015. REUTERS/Carlos Garcia Rawlins TPX IMAGES OF THE DAY

Football - Liverpool v West Ham United - Barclays Premier League - Anfield - 29/8/15
West Ham's Dimitri Payet in action with Liverpool's Danny Ings
Reuters / Eddie Keogh
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Hockey - Unibet EuroHockey Championships 2015 - Lee Valley Hockey Centre, Queen Elizabeth Olympic Park - 24/8/15
Scotland's Fiona Bruce with cut on her head
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Hockey - Unibet EuroHockey Championships 2015 - Lee Valley Hockey Centre, Queen Elizabeth Olympic Park - 24/8/15
Scotland's Fiona Bruce
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Football - Hull City v Fulham - Sky Bet Football League Championship - The Kingston Communications Stadium - 19/8/15
Fulham's Matt Smith receives treatment before going off injured
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Football - Reading v Leeds United - Sky Bet Football League Championship - The Madejski Stadium - 16/8/15
Reading?s Jordan Obita lies injured after being hit by the ball
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Football - Celtic v Inverness Caledonian Thistle - Ladbrokes Scottish Premiership - Celtic Park - 15/8/15
Celtic's Scott Brown lies injured
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Reginaldo Vieira (L) of Brazil fights with Dileno Lopes of Brazil during their Ultimate Fighting Championship (UFC) match, a professional mixed martial arts (MMA) competition in Rio de Janeiro, Brazil August 1, 2015. REUTERS/Ricardo Moraes 

Vitor Miranda (top) of Brazil fights with Clint Hester of U.S during their Ultimate Fighting Championship (UFC) match, a professional mixed martial arts (MMA) competition in Rio de Janeiro, Brazil August 1, 2015. REUTERS/Ricardo Moraes 

Hugo Viana (R) of Brazil fights with Guido Cannetti of Argentina during their Ultimate Fighting Championship (UFC) match, a professional mixed martial arts (MMA) competition in Rio de Janeiro, Brazil August 1, 2015. REUTERS/Ricardo Moraes 

Hugo Viana (L) of Brazil fights with Guido Cannetti of Argentina during their Ultimate Fighting Championship (UFC) match, a professional mixed martial arts (MMA) competition, in Rio de Janeiro, Brazil August 1, 2015. REUTERS/Ricardo Moraes 

Football - Norwich City v Brentford - Pre Season Friendly - Carrow Road - 1/8/15
Norwich's Youssouf Mulumbu before going off injured
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AC Milan's Carlos Bacca reacts after falling during their International Champions Cup friendly match against Inter Milan in Shenzhen, China July 25, 2015. REUTERS/Bobby Yip 

Urugay's Maximo Cancio (L) is blocked by Brazil's Vinicius Teixeira during their men's handball match at the 2015 Pan Am Games in Toronto, Ontario July 19, 2015. REUTERS/Chris Helgren 

Riders and their bicycles fill the road after a fall during the 159,5 km (99 miles) third stage of the 102nd Tour de France cycling race from Anvers to Huy, Belgium, July 6, 2015. REUTERS/Eric Gaillard 

Lotto-Jumbo rider Laurens ten Dam of the Netherlands lies on the ground after a fall during the 159,5 km (99 miles) third stage of the 102nd Tour de France cycling race from Anvers to Huy, Belgium, July 6, 2015. REUTERS/Benoit Tessier 

A reveller is punched in the face by another reveller during the start of the San Fermin Festival in Pamplona, Spain, July 6, 2015. The festival, best known for its daily running of the bulls, kicked off on Monday with the traditional "Chupinazo" rocket launch and will run until July 14. REUTERS/Susana Vera TPX IMAGES OF THE DAY

A man has an egg smashed on his head to raise money for charity during the World Egg Throwing Championships and Vintage Day in Swaton, Britain June 28, 2015. REUTERS/Darren Staples 

Teymur Mammadov (L) of Azerbaijan and Valentino Manfredonia fight during their 81kg men's Light Heavy weight boxing final fight at the 1st European Games in Baku, Azerbaijan, June 25 , 2015. REUTERS/Stoyan Nenov TPX IMAGES OF THE DAY

Tennis - Aegon Championships - Queens Club, London - 20/6/15
Serbia's Viktor Troicki after sustaining an injury during his semi final match
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Blood gushes from a bull during a bullfight with Spanish matador Rafaelillo at the Ventas bullring in Madrid June 7, 2015. REUTERS/Javier Barbancho 

Football - Arsenal v Aston Villa - FA Cup Final - Wembley Stadium - 30/5/15
Arsenal's Jack Wilshere in action with Aston Villa's Jores Okore
Reuters / Eddie Keogh
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Empty seats are pictured while Rimouski Oceanic's Jeremy Lepine hits Quebec Remparts' Guillaume Gauthier during the first period of their Memorial Cup hockey game at the Colisee Pepsi in Quebec City, May 28, 2015. REUTERS/Mathieu Belanger TPX IMAGES OF THE DAY

Japan's Mizuho Sakaguchi (R) fights for the ball against Italy's Cristiana Girelli during their women's international friendly soccer match in Nagano, central Japan, May 28, 2015. REUTERS/Toru Hanai TPX IMAGES OF THE DAY

An Indian policeman uses a baton to disperse a protester during a demonstration in Srinagar, May 28, 2015. Indian police on Thursday detained dozens of protesting government employees in Srinagar as they attempted to reach the civil secretariat, which houses the office of Kashmir's chief minister and his colleagues, to demand their long pending arrears and a regularisation of temporary jobs, according to protesters. REUTERS/Danish Ismail TPX IMAGES OF THE DAY

A man has his head tattooed during the Great British Tattoo Show in Alexandra Palace in north London, Britain May 23, 2015. REUTERS/Neil Hall TPX IMAGES OF THE DAY

A referee falls over Canada's Dan Hamhuis during the Ice Hockey World Championship final game between Russia and Canada at the O2 arena in Prague, Czech Republic May 17, 2015. REUTERS/Laszlo Balogh TPX IMAGES OF THE DAY 

Football - Sunderland v Leicester City - Barclays Premier League - Stadium of Light - 16/5/15
Sunderland's Sebastian Coates and Leicester's Leonardo Ulloa in action
Action Images via Reuters / Ed Sykes
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ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY

A boy, injured from what activists said was shelling by forces loyal to Syria's President Bashar al-Assad in Ain Larouz village in the Jabal al-Zawiya region, reacts at a field hospital in Idlib province, May 15, 2015. REUTERS/Abed Kontar TPX IMAGES OF THE DAY

Felix Sturm of Germany (R) and Fedor Chudinov of Russia fight during their super - middleweight WBA world championship title fight in Frankfurt, Germany, May 9, 2015. REUTERS/Kai Pfaffenbach 

Switzerland's Timo Helbling (R) punches Sweden's Anton Lander (R) next to linesman Jon Kilian during their Ice Hockey World Championship game at the O2 arena in Prague, Czech Republic, May 9, 2015. REUTERS/David W Cerny TPX IMAGES OF THE DAY 

Sevilla's Victor Machin "Vitolo" (top) falls beside Fiorentina's Matias Fernandez during their Europa League semi-final, first leg soccer match at Ramon Sanchez Pizjuan stadium in Seville May 7, 2015. REUTERS/Marcelo del Pozo TPX IMAGES OF THE DAY

Football - Hull City v Arsenal - Barclays Premier League - The Kingston Communications Stadium - 4/5/15
Hull City's David Meyler receives treatment after sustaining a facial injury
Action Images via Reuters / Lee Smith
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Germany's Kai Hospelt (L) checks Canada's Tyler Ennis against the boards during their Ice Hockey World Championship game at the O2 arena in Prague, Czech Republic May 3, 2015. REUTERS/David W Cerny TPX IMAGES OF THE DAY

London Olympic gold medalist, Ryota Murata (R) of Japan fights with Douglas Ataide of Brazil during their middleweight boxing bout in Tokyo, Japan, May 1, 2015. REUTERS/Yuya Shino TPX IMAGES OF THE DAY

A demonstrator looks up after being sprayed with pepper spray during clashes in Baltimore, Maryland April 27, 2015. Maryland Governor Larry Hogan declared a state of emergency and activated the National Guard to address the violence in Baltimore, his office said on Monday. Several Baltimore police officers were injured on Monday in violent clashes with young people after the funeral of a black man, Freddie Gray, who died in police custody, and local law enforcement warned of a threat by gangs. REUTERS/Shannon Stapleton 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH
A policeman is assisted by civilians after he was injured in clashes with protestors during a rally against the ruling CNDD-FDD party's decision to allow President Pierre Nkurunziza to run for a third five-year term in office, in the capital Bujumbura, April 27, 2015. Police fired tear gas and water cannon at protesters rallying in Burundi's capital on Monday against the president's decision to run for a third term, a move critics say violates the constitution. REUTERS/Thomas Mukoya TPX IMAGES OF THE DAY

Spanish matador David Galvan is tackled by a bull during a bullfight at The Maestranza bullring in the Andalusian capital of Seville, southern Spain April 24, 2015. REUTERS/Marcelo del Pozo TPX IMAGES OF THE DAY

Palestinians tend to a protester, whom witnesses said was shot and wounded by Israeli troops, during clashes following a protest against Jewish settlements in the West Bank village of Nabi Saleh, near Ramallah April 24, 2015.
REUTERS/Mohamad Torokman

AS Roma's Vassilis Torosidis (R) jumps for the ball against Atalanta's Guglielmo Stendardo during their Serie A soccer match at the Olympic stadium in Rome April 19, 2015. REUTERS/Tony Gentile TPX IMAGES OF THE DAY

An Indian Muslim devotee, who is on a pilgrimage to the shrine of Sufi saint Khwaja Moinuddin Chishti for Urs, performs a stunt during a procession at Ajmer in the desert Indian state of Rajasthan April 19, 2015. Urs is an annual festival which is held for over six days at Ajmer, commemorating the death anniversary of Sufi saint Chishti. REUTERS/Himanshu Sharma
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Bayern Munich's Robert Lewandowski (R) and Porto's Alex Sandro fight for the ball during their Champions League quarterfinal first leg soccer match at Dragao stadium in Porto April 15, 2015. REUTERS/Rafael Marchante TPX IMAGES OF THE DAY 

Football - Paris St Germain v FC Barcelona - UEFA Champions League Quarter Final First Leg - Parc des Princes, Paris, France - 15/4/15
Barcelona's Marc Andre ter Stegen punches clear
Reuters / Christian Hartmann

Football - Liverpool v Newcastle United - Barclays Premier League - Anfield - 13/4/15
Liverpool's Lucas Leiva and Dejan Lovren in action with Newcastle's Ayoze Perez
Reuters / Andrew Yates
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Worshippers hold candles as they take part in the Christian Orthodox Holy Fire ceremony at the Church of the Holy Sepulchre in Jerusalem's Old City, April 11, 2015. REUTERS/Ammar Awad

Horse Racing - Crabbie's Grand National Festival - Aintree Racecourse - 9/4/15
Catherine Walton on Ockey De Neulliac fall at Valentine's fence during the 16:05 Crabbie's Fox Hunters' Chase
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Barcelona's Pedro Rodriguez crashes with Almeria's goalkeeper Julian Cuesta (L) during their Spanish first division soccer match at Camp Nou stadium in Barcelona April 8, 2015. REUTERS/Albert Gea 

A resident uses broken glass to slit the back of a penitent before a reenactment of the crucifixion of Jesus Christ on Good Friday in Cutud, San Fernando Pampanga north of Manila April 3, 2015. REUTERS/Lorgina Minguito