REFILE - CORRECTING TYPOPhilanthropist Bill Gates (R) embraces Priscilla Chan (2nd R) as Mark Zuckerberg looks on during an announcement of 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