1. Veterans Affairs Medical Center, White River Junction, Vermont, and Dartmouth-Hitchcock Medical Center and Dartmouth Geisel School of Medicine, Hanover, New Hampshire (H.P.)
2. Veterans Affairs Medical Center, White River Junction, Vermont, and Dartmouth Geisel School of Medicine, Hanover, New Hampshire (J.C.A., D.J.R.)
3. Veterans Affairs Medical Center, White River Junction, Vermont (A.A.)
4. Dartmouth-Hitchcock Medical Center and Dartmouth Geisel School of Medicine, Hanover, New Hampshire (A.H.C.)
5. The Dartmouth Institute, Lebanon, New Hampshire (T.A.M.).