1. University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania (A.R.L.)
2. Stanford University School of Medicine, Stanford, California (S.N.G.)
3. American College of Physicians, Philadelphia, Pennsylvania (A.M., C.B.S., C.D.M.)
4. University of Texas Health Science Center, San Antonio, Texas (J.E.C.)
5. Fox Chase Cancer Center and Temple University, Philadelphia, Pennsylvania (E.A.R.)