title: The problem with ultra-endurance athletes.
authors: George
authors: G
authors: Wortley
authors: Arthur A
authors: AA
authors: Islas
mesh_terms: D056352:Athletes / Q000523:psychology*; D006801:Humans; D010807:Physical Endurance / Q000502:physiology*; D010817:Physician-Patient Relations; D012420:Running / Q000502:physiology* / Q000523:psychology; D013178:Sports Medicine / Q000379:methods*