TY - RPRT TI - Resident participation in residency programs. AU - J J Frey AU - B J Engebretsen AU - J W Olson AU - L P Carmichael PY - 1975 DO - 10.1097/00001888-197508000-00002 UR - https://pubmed.ncbi.nlm.nih.gov/1152003/ ID - 1152003 ER -