Insidious illness and performance.
Ortega
R
R
D000328:Adult; D000747:Anemia, Hypochromic / Q000209:etiology / Q000503:physiopathology*; D000776:Anesthesiology / Q000592:standards*; D002983:Clinical Competence; D006471:Gastrointestinal Hemorrhage / Q000150:complications / Q000209:etiology; D006484:Hemorrhoids / Q000150:complications; D006801:Humans; D008297:Male