1. Yale University School of Medicine, New Haven, CT (L.H.Y., C.M.V., S.E.I., J.P.C., E.S., A.L., D.L.J., S.E.P., W.N.K.).
2. VA Medical Center and University of Colorado School of Medicine, Denver (G.G.S.).
3. Maine Medical Center, Portland (M.J.G.).
4. Alpert Medical School of Brown University, Providence, RI (K.L.F., J.D.A.).
5. University of Pennsylvania Perelman School of Medicine, Philadelphia (R.C., D.M.K.).
6. University of Rochester School of Medicine and Dentistry, NY (F.S.L.).