3Srinivasan M,Wilkes M,Stevenson F,et al.Comparing problem-basedlearning with case-based learning:effects of a major curricular shift at twoinstitutions. Academic Medicine . 2007
4Gilkison A.Problem-based learning tutor expertise:the need for different questions. Medical Education . 2004
6Littlewood S,Ypinazar V,Margolis S,et al. Early practical experience and the social responsiveness of clinical education:systematic review [J]. BMJ,2005,331(7513) :387-391.