4Gowland E, Kay HE, Spillman JC, et al. Agglutination of platelets by a serum factor in the presence of EDTA[J]. J Clin Pathol, 1969,22(4):460-464.
5Tu MG, Yu CH, Wu LT, et al. Dentaland medical students perspectives on early exposure to PBL in Taiwan[J]. J Dent Educ, 2012, 76(6): 746-751.
6Townsend G C, Kim M, Sankey D. Dynamic Systems (Complexity) theory as a new conceptual model for research- ing PBL in dental education [J]. Eur J Dent Educ, 2012, 16 (1): 43-51.
7Townsend G. Problem-based learning interventions in a traditional curriculumare an effective learning tool[J]. Evid BasedDent, 20il, 2(4): 115-116.
