Colorectal cancer risk.
Al-Hassan
Nader
N
D015179:Colorectal Neoplasms / Q000175:diagnosis*; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D012002:Rectal Diseases / Q000209:etiology*; D012307:Risk Factors; D012812:Sigmoidoscopy / Q000379:methods