1. From the Medical Scientist Training Program, Feinberg School of Medicine, Northwestern University, Chicago, Ill (A.J.H.S.); and Department of Diagnostic Radiology, Oregon Health and Science University, 3181 SW Sam Jackson Park Rd, L340, Portland, OR 97239-3098 (C.M., A.M., C.W., D.B., S.O., N.M.).