Altitude and skiing.
D000064:Acclimatization; D000531:Altitude; D003490:Cyanosis / Q000209:etiology; D006801:Humans; D000860:Hypoxia / Q000209:etiology; D011087:Polycythemia Vera / Q000209:etiology; D011654:Pulmonary Edema / Q000209:etiology; D012119:Respiration; D012865:Skiing; D013178:Sports Medicine