The next best thing to an answer about tutors' content expertise in PBL.
Wilkerson
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Center for Educational Development and Research, University of California, Los Angeles.
D000124:Achievement; D003479:Curriculum; D004504:Education, Medical, Undergraduate / Q000379:methods*; D005180:Faculty, Medical; D006801:Humans; D007858:Learning; D009426:Netherlands; D011340:Problem Solving; D011361:Professional Competence; D013336:Students, Health Occupations / Q000523:psychology; D014481:United States