1. Stanford University School of Medicine, Stanford, California, and Bern University Hospital and University of Bern, Bern, Switzerland (M.R.B.)
2. Norwegian Institute of Public Health, Oslo, Norway, and Stanford University, Stanford, California (H.Ø.)
3. Stanford University School of Medicine, Stanford, California, and Intermountain Healthcare, Murray, Utah (H.L.C.)
4. Stanford University and Veterans Affairs Palo Alto Health Care System, Palo Alto, California (P.H.)
5. Stanford University, Stanford, California, and Veterans Affairs Palo Alto Health Care System, Palo Alto, California (D.K.O.)
6. Stanford University, Stanford, California (J.D.G.)