Dana Vollmer (L), Rebecca Soni (C), Missy Franklin (R) and Allison Schmitt (in water) of the U.S. celebrate after winning the gold in the women's 4x100m medley relay final with a world record during the London 2012 Olympic Games at the Aquatics Centre August 4, 2012. REUTERS/Jorge Silva (BRITAIN - Tags: SPORT OLYMPICS SPORT SWIMMING)