1. University of Pennsylvania, Perelman School of Medicine, Philadelphia, Pennsylvania (M.D.G., J.Y.H., Q.W.)
2. University of Pennsylvania and Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania (J.F.B.)
3. Oregon Health & Science University, Portland, Oregon (K.W.)
4. University of Alabama at Birmingham, Birmingham, Alabama (L.C., F.X., H.Y., J.R.C.)