human 14 problem based learning Humans 8 Problem-Based Learning 8 adult 6 female 6 human experiment 6 article 5 curriculum 5 male 5 medical education 5 medical student 5 controlled study 4 education 4 pharmacy student 4 teaching 4 Adult 3 Article 3 Curriculum 3 Deep learning 3 Female 3 Male 3 PBL 3 Problem-based learning 3 clinical article 3 medical school 3 procedures 3 questionnaire 3 self-directed learning 3 skill 3