Asghari Jafarabadi, M.; Hajizadeh, E.; Kazemnejad, A.; Fatemi, S. R. A Comparative Study on the Prognostic Impact of Concurrent Smoking and Alcohol Drinking on Colon and Rectal Cancers: A Frailty Competing Risks Survival Analysis. Gastroenterol Hepatol Bed Bench 2009, 3.