9Dolmans DHJM,De Grave W,Wolfhagen IHAP,et al.Problem-based learning: future challenges for educational practice and researchMedical Education,2005.
10S Avital,H Hermon,R Greenberg,E Karin,Y Skornick.Learning curve in laparoscopic colorectal surgery: our first 100 patients. The Israel Medical Association Journal . 2006