1. West Virginia University, Morgantown, West Virginia (S.U.K., M.O., M.U.K.)
2. John H. Stroger, Jr. Hospital of Cook County, Chicago, Illinois (M.S.K.)
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (D.Z.)
4. Keele University, Stoke-on-Trent, United Kingdom, and Thomas Jefferson University, Philadelphia, Pennsylvania (M.A.M.)
5. Johns Hopkins School of Medicine, Baltimore, Maryland (N.S., R.K.H.)
6. Saint Agnes Hospital, Baltimore, Maryland (A.A.)
7. Johns Hopkins Bloomberg School of Public Health and Johns Hopkins School of Medicine, Baltimore, Maryland (E.D.M.)