Table 1.

MEDLINE was used to search different combinations of key words in order to find supportive and relevant data regarding PBL curriculum in medical schools

*Keywords	1	1 and 2	1, 2, 6	1 and 3	1, 3, 6	1 and 4	1, 4, 6	1 and 5	1, 5, 6
Number of nonreview articles	2774	6	1	112	20	169	35	139	30
Number of review articles	238	0	0	5	3	20	10	8	2

Notes:

^*Keywords 1, problem-based learning and medical education; keywords 2, structuring of knowledge; keywords 3, clinical reasoning; keywords 4, self-directed learning; keywords 5, motivation; keywords 6, traditional curriculum.