PT - JOURNAL ARTICLE AU - George Wortley AU - Arthur A Islas TI - The problem with ultra-endurance athletes AID - 10.1136/bjsports-2011-090399 DP - 2011 Nov 01 TA - British Journal of Sports Medicine PG - 1085--1085 VI - 45 IP - 14 4099 - http://bjsm.bmj.com/content/45/14/1085.short 4100 - http://bjsm.bmj.com/content/45/14/1085.full SO - Br J Sports Med2011 Nov 01; 45