Switzerland's Dario Cologna competes by the Olympic rings in the Men's Cross-Country Skiing 15km + 15km Skiathlon at the Laura Cross-Country Ski and Biathlon Center during the Sochi Winter Olympics on February 9, 2014, in Rosa Khutor.AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)

Switzerland’s Dario Cologna competes by the Olympic rings in the Men’s Cross-Country Skiing 15km + 15km Skiathlon at the Laura Cross-Country Ski and Biathlon Center during the Sochi Winter Olympics on February 9, 2014, in Rosa Khutor.AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)

Switzerland's Dario Cologna competes by the Olympic rings in the Men's Cross-Country Skiing 15km + 15km Skiathlon at the Laura Cross-Country Ski and Biathlon Center during the Sochi Winter Olympics on February 9, 2014, in Rosa Khutor. AFP PHOTO / ALBERTO PIZZOLI (Photo credit should read ALBERTO PIZZOLI/AFP/Getty Images)

May 13, 2016 3:59 AM (UTC+8)