9Kong J,Li X,Wang Y,et al.Effect of digital problem-based learning cases on student learning outcomes in ophthalmology cour ses.Arch Ophthalmol,2009,127(9):1211-1214.
10Lewis AD,Braganza Menezes DA,McDermott HE,et al.A comparison of course-related stressors in undergraduate problem-basedlearning (PBL) versus non-PBL medical programmes.BMC Med Educ,2009,(9):60-67.
