REFILE - CORRECTING TYPOPriscilla Chan (R) embraces her husband Mark Zuckerberg while announcing the Chan Zuckerberg Initiative to "cure, prevent or manage all disease" by the end of the century during a news conference at UCSF Mission Bay in San Francisco, California, U.S. September 21, 2016. REUTERS/Beck Diefenbach TPX IMAGES OF THE DAY

REFILE - CORRECTING TYPOPriscilla Chan (R) and her husband Mark Zuckerberg announce the Chan Zuckerberg Initiative to "cure, prevent or manage all disease" by the end of the century during a news conference at UCSF Mission Bay in San Francisco, California, U.S. September 21, 2016. REUTERS/Beck Diefenbach

South Korea's Kim Yuna stands in the limelight in front of a lit Korean flag during the Figure Skating Gala Exhibition at the 2014 Sochi Winter Olympics February 22, 2014. REUTERS/David Gray

South Korea's Kim Yuna performs during the Figure Skating Gala Exhibition at the 2014 Sochi Winter Olympics February 22, 2014. REUTERS/David Gray

South Korea's Kim Yuna performs during the Figure Skating Gala Exhibition at the 2014 Sochi Winter Olympics February 22, 2014. REUTERS/David Gray

The royal palace is pictured in Bangkok, Thailand, August 31, 2016. Picture taken August 31, 2016. REUTERS/Jorge Silva

Tourists hold up umbrellas at a department store in Bangkok, Thailand, September 21, 2016. Picture taken September 21, 2016. REUTERS/Athit Perawongmetha

People hold up umbrella as they walk past the Grand palace in Bangkok, Thailand, June 6, 2016. Picture taken June 6, 2016. REUTERS/Jorge Silva