Elite athletes travelling to international destinations >5 time zone differences from their home country have a 2–3-fold increased risk of illness Free Martin P Schwellnus1,2, Wayne Elton Derman1,2, Esme Jordaan3, Tony Page4, Mike Ian Lambert1,2, Clint Readhead5, Craig Roberts5,6, Ryan Kohler7, Robert Collins8,9, Stephen Kara10, Michael Ian Morris11, Org Strauss12, Sandra Webb13 lDepartment of Human Biology, Faculty of Health Sciences, UCT/MRC Research Unit for Exercise Science and Sports...