Japan's table tennis Olympian Ai Fukuhara (R) and her husband Taiwan's table tennis Olympian Chiang Hung-chieh bow as they leave a news conference to announce their marriage in Tokyo, Japan, September 21, 2016. REUTERS/Toru Hanai

Japan's table tennis Olympian Ai Fukuhara (R) has her wedding ring placed on her finger by her husband Taiwan's table tennis Olympian Chiang Hung-chieh at a news conference to announce their marriage in Tokyo, Japan, September 21, 2016. REUTERS/Toru Hanai

Philippine President Rodrigo Duterte arrives at the military's Camp Tecson to talk to soldiers in San Miguel, Bulacan in northern Philippines September 15, 2016. REUTERS/Erik De Castro

A newly constructed Target store is shown in San Diego, California May 17, 2016. REUTERS/Mike Blake

A view shows the U.S. Food and Drug Administration (FDA) headquarters in Silver Spring, Maryland August 14, 2012. REUTERS/Jason Reed/File Photo

City workers walk past the Bank of England in the City of London, Britain, March 29, 2016. REUTERS/Toby Melville/File Photo

A shopkeeper sells groceries to a customer at his shop in Kolkata, India, September 12, 2016. REUTERS/Rupak De Chowdhuri

Students throw stones during clashes with security at Johannesburg's University of the Witwatersrand. Demonstrations this year and in 2015 over the cost of university education -- prohibitive for many black students -- have highlighted frustration at the inequalities that persist more than two decades after the 1994 end of white minority rule. REUTERS/Siphiwe Sibeko