Reed DA, Shanafelt TD, Satele DW, Power DV, Eacker A, Harper W, Moutier C, Durning S, Massie FS, Thomas MR, Sloan JA, Dyrbye LN. Relationship of pass/fail grading and curriculum structure with well-being among preclinical medical students: a multi-institutional study. Acad Med. 2011 Nov; 86(11):1367-73.