Asghari Jafarabadi, M., Hajizadeh, E., Kazemnejad, A. and Fatemi, S. R. (2009) “A comparative study on the prognostic impact of concurrent smoking and alcohol drinking on colon and rectal cancers: A frailty competing risks survival analysis”, Gastroenterology and Hepatology from Bed to Bench, 3(1). doi: 10.22037/ghfbb.v3i1.65.