1. West Virginia University, Morgantown, West Virginia (S.U.K., M.U.K., S.V.)
2. Cleveland Clinic, Cleveland, Ohio (H.R.)
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (D.Z.)
4. East Carolina University, Greenville, North Carolina (L.V., V.O.)
5. Mayo Clinic, Rochester, Minnesota (I.B.R., M.H.M.)
6. John H. Stroger, Jr. Hospital of Cook County, Chicago, Illinois (M.S.K.)
7. Guthrie Robert Packer Hospital, Sayre, Pennsylvania (E.K.)
8. Johns Hopkins School of Medicine, Baltimore, Maryland (M.J.B.)
9. Johns Hopkins Bloomberg School of Public Health and Johns Hopkins School of Medicine, Baltimore, Maryland (E.G.)
10. Johns Hopkins School of Medicine and Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (E.D.M.)