4Graham H J, Seabrook M A, Woodfield S J. Structured packs for independent learning: a comparison of learning outcome and acceptability with conventional teaching. Med Educ. 1999;33:579- 584.
5Steele DJ, Medder JD, Turner P. A comparison of learning outcomes and attitudes in student- versus faculty - led problem- based learning: an experimental study. Med Educ. 2000; 34: 23 - 29.
6Kaufman DM. Problem- based learning- time to step back? Med Educ.2000;34:509 - 511.
7Sorgal DT. Peer tutoring and student outcomes in a problem- based course. Med Educ.1994;28: 284-9.
