Buddhist monks wearing face masks offer prayer during the funeral procession of Ang Rita Sherpa, the first man to climb Mount Everest 10 times without the use of supplement oxygen, who was also known as the "snow leopard", in Kathmandu, Nepal, September 23, 2020. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY

A worker wearing a protective mask disinfects oxygen cylinders before delivering to a hospital, amid the spread of the coronavirus disease (COVID-19), in the holy city of Kerbala, Iraq July 11, 2020. Picture taken July 11, 2020. REUTERS/Alaa Al-Marjani

A worker wearing a mask inspects refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

Workers wearing masks inspect refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

Workers wearing masks check refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

A worker wearing a mask inspects refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

A worker wearing a mask inspects refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

Workers wearing protective masks inspect refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 29, 2020. REUTERS/Thaier al-Sudani

A worker wearing a mask checks a refilled oxygen cylinder before delivering it to a hospital, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 29, 2020. REUTERS/Thaier al-Sudani

A worker wearing a mask holds refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

A worker wearing a mask inspects refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 28, 2020. Picture taken June 28, 2020. REUTERS/Thaier al-Sudani

A worker wearing a mask inspects refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 29, 2020. REUTERS/Thaier al-Sudani

Workers wearing protective masks inspect refilled oxygen cylinders before delivering them to hospitals, at a factory, amid the coronavirus disease (COVID-19) spread, in Baghdad, Iraq June 29, 2020. REUTERS/Thaier al-Sudani

A medical specialist wearing protective gear accompanies a woman wearing an oxygen mask outside a hospital for patients infected with the coronavirus disease (COVID-19) on the outskirts of Moscow, Russia April 21, 2020. REUTERS/Tatyana Makeyeva

An oxygen mask lays on a bed as a resident is seen in a background at the house for elderly Residence Christalain during coronavirus disease (COVID-19) outbreak, in the Brussels commune of Jette, Belgium April 13, 2020. REUTERS/Yves Herman

People wearing face masks wait with oxygen tanks at a private distributor that recharges tanks, amid the spread of the coronavirus disease (COVID-19), in Guayaquil, Ecuador April 9, 2020. REUTERS/Vicente Gaibor del Pino

A man in a face mask waits with an oxygen tank at a private distributor that recharges tanks, amid the spread of the coronavirus disease (COVID-19), in Guayaquil, Ecuador April 9, 2020. REUTERS/Vicente Gaibor del Pino

A doctor wearing a face mask adjusts oxygen devices at a newly opened quarantine centre, following the outbreak of coronavirus disease (COVID-19), in Misrata, Libya March 30, 2020. Picture taken March 30, 2020. REUTERS/Ayman Al-Sahili

Healthcare workers wearing protective face masks bring oxygen bottles to the emergency unit at 12 de Octubre Hospital, amid the coronavirus disease (COVID-19) outbreak in Madrid, Spain March 30, 2020. REUTERS/Juan Medina

A man from a Bellevue Healthcare van wheels in oxygen tanks while wearing a mask and gloves at Aegis Living at Marymoor, an assisted living facility linked to several cases of coronavirus, during the coronavirus disease (COVID-19) outbreak in Redmond, Washington, U.S. March 21, 2020. REUTERS/Lindsey Wasson

Dec 28, 2019; Glendale, AZ, USA; Clemson Tigers quarterback Trevor Lawrence (16) breathes oxygen with a mask on the sidelines against the Ohio State Buckeyes in the 2019 Fiesta Bowl college football playoff semifinal game at State Farm Stadium. Mandatory Credit: Mark J. Rebilas-USA TODAY Sports

A participant wearing a costume attends a Halloween party at a village in Bangkok, Thailand, October 31, 2019. REUTERS/Athit Perawongmetha

A statue of the Virgin Mary wears a yellow vest in a street in Nantes, France, December 10, 2018. REUTERS/Stephane Mahe

Firefighters battle the Woolsey Fire as it continues to burn in Malibu, California, U.S., November 11, 2018. REUTERS/Eric Thayer TPX IMAGES OF THE DAY

Participants parade through the town during the annual Bonfire Night festivities in Lewes, Britain, November 5, 2018. REUTERS/Toby Melville

QUALITY REPEAT - Susan Williams puts on her oxygen mask in her rocking chair in her living room with no wall after she rode out the hurricane in her home following Hurricane Michael in Mexico Beach, Florida, U.S., October 12, 2018. REUTERS/Carlo Allegri

Susan Williams puts on her oxygen mask in her rocking chair in her living room with no wall after she rode out the hurricane in her home following Hurricane Michael in Mexico Beach, Florida, U.S., October 12, 2018. REUTERS/Carlo Allegri

Belarusian hunters cut a killed elk as they take part in the hunting of wild ungulates near the village of Myshanka, Belarus October 6, 2018. Picture taken October 6, 2018. REUTERS/Vasily Fedosenko TPX IMAGES OF THE DAY

Soccer Football - UEFA Nations League - League A - Group 4 - England v Spain - Wembley Stadium, London, Britain - September 8, 2018 England's Luke Shaw is stretchered off the pitch wearing an oxygen mask after sustaining an injury Action Images via Reuters/John Sibley

A Palestinian demonstrator uses a sling to hurl back a tear gas canister fired by Israeli troops during clashes at a protest against Israeli land seizures for Jewish settlements, in the village of Ras Karkar, near Ramallah in the occupied West Bank September 4, 2018. REUTERS/Mohamad Torokman

Participants dance in costumes during the West Indian-American Carnival Day Parade in the Brooklyn borough of New York, U.S., September 3, 2018. REUTERS/Gabriela Bhaskar

A Palestinian demonstrator looks on as he takes cover during clashes with Israeli troops at a protest near the Jewish settlement of Qadomem, in village of Kofr Qadom near Nablus in the occupied West Bank August 17, 2018. REUTERS/Mohamad Torokman

A firefighter wears a flame resistant uniform as wildfire burns in the town of Rafina, near Athens, Greece, July 23, 2018. REUTERS/Costas Baltas

A volunteer work to extinguish wildfires near the Paranoa neighbourhood in Brasilia, Brazil, July 20, 2018. REUTERS/Ueslei Marcelino

A participant stands behind a rainbow flag during a gay pride parade promoting lesbian, gay, bisexual and transgender rights, in Chennai, India June 24, 2018. REUTERS/P. Ravikumar TPX IMAGES OF THE DAY

A participant stands behind a rainbow flag during a gay pride parade promoting lesbian, gay, bisexual and transgender rights, in Chennai, India June 24, 2018. REUTERS/P. Ravikumar

Revellers participate in Regenbogenparade gay pride parade in Vienna, Austria June 16, 2018. REUTERS/Heinz-Peter Bader

A riot police officer stands guard before the start of the G7 Summit in Quebec City, Quebec, Canada, June 8, 2018. REUTERS/Jonathan Ernst

Soldiers of the Hawaii National Guard carry gas masks in Leilani Estates during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S., May 18, 2018. REUTERS/Terray Sylvester

An onlooker watches as lava erupts from a fissure east of the Leilani Estates subdivision during ongoing eruptions of the Kilauea Volcano, U.S., May 12, 2018. REUTERS/Terray Sylvester

A female security member shows her ink-stained finger after casting her vote at a polling station two days before polls open to the public in a parliamentary election in Najaf, Iraq May 10, 2018. REUTERS/Alaa al-Marjani TPX IMAGES OF THE DAY

Participants gather for the annual May bank holiday "Jack In The Green" parade and festival in Hastings, Britain, May 7, 2018. REUTERS/Toby Melville

A participant takes part in the annual May bank holiday "Jack In The Green" parade and festival in Hastings, Britain, May 7, 2018. REUTERS/Toby Melville

A participant takes part in the annual May bank holiday "Jack In The Green" parade and festival in Hastings, Britain, May 7, 2018. REUTERS/Toby Melville

A participant takes part in the annual May bank holiday "Jack In The Green" parade and festival in Hastings, Britain, May 7, 2018. REUTERS/Toby Melville

A demonstrator with a Palestinian flag looks on during clashes with Israeli troops at the Israel-Gaza border at a protest demanding the right to return to their homeland, in the southern Gaza Strip April 6, 2018. REUTERS/Ibraheem Abu Mustafa TPX IMAGES OF THE DAY

A woman strokes a donkey before the procession of the "Virgem da Atalaia" during Holy Week in Alcochete, near Lisbon, Portugal April 1, 2018. REUTERS/Rafael Marchante

A donkey is prepared before the procession of the "Virgem da Atalaia" during Holy Week in Alcochete, near Lisbon, Portugal April 1, 2018. REUTERS/Rafael Marchante

A girl dressed as an angel walks in the middle of a street decorated by residents and local artists with painted wood chips in celebration of Easter Sunday, in the historic city of Ouro Preto, Minas Gerais state, Brazil April 1, 2018. REUTERS/Washington Alves

A statue of the Risen Christ is seen during an Easter Sunday procession in Cospicua, Malta April 1, 2018. REUTERS/Darrin Zammit Lupi TPX IMAGES OF THE DAY

A statue of the Risen Christ is seen during an Easter Sunday procession in Cospicua, Malta April 1, 2018. REUTERS/Darrin Zammit Lupi

Boxing - Alexander Povetkin vs David Price - WBA Inter-Continental & WBO International Heavyweight Titles - Principality Stadium, Cardiff, Britain - March 31, 2018 David Price wears an oxygen mask after losing the fight Action Images via Reuters/Andrew Couldridge

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi TPX IMAGES OF THE DAY

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi

Worshippers take part in the procession of the Madonna della Vergine Desolata during the Holy Week in Canosa di Puglia, Italy, March 31, 2018. REUTERS/Alessandro Bianchi

Catholics take part in the "Procession of Silence" on Good Friday during Holy Week in Ciudad Juarez, Mexico March 30, 2018. REUTERS/Jose Luis Gonzalez TPX IMAGES OF THE DAY