WOERTH AM MAIN, GERMANY - SEPTEMBER 08:  German NBA Basketball player Dirk Nowitzki attends a press conference as he is presented as the new UNICEF-Ambassador on September 8, 2013 in Woerth am Main, Germany. Dirk Nowitzki campaigns for UNICEF against the worldwide children's malnutrition.  (Photo by Thomas Lohnes/Getty Images)