1. University of Colorado School of Medicine, Denver, Colorado (M.E.B.)
2. Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland (A.D.M., J.S.V.)
3. Rhode Island Hospital/Alpert Medical School and Brown University, Providence, Rhode Island (M.L.R.)
4. VA Ann Arbor Healthcare System, Ann Arbor, Michigan (D.T.M.)
5. University of California, Davis, School of Medicine, Sacramento, California (G.J.W.)