1. Centers for Behavioral and Preventive Medicine, The Miriam Hospital , Providence, RI 02906, USA
2. Department of Psychiatry and Human Behavior, Warren Alpert Medical School of Brown University , Providence, RI 02906, USA
3. Department of Family Medicine, Uniformed Services University of the Health Sciences School of Medicine , Bethesda, MD 20814, USA
4. Department of Family Medicine, University of Iowa Carver College of Medicine, University of Iowa Health Care , Iowa City, IA 52242, USA
5. Henry M. Jackson Foundation for the Advancement of Military Medicine , Bethesda, MD 20817, USA
6. Defense Centers for Public Health—Portsmouth , Portsmouth, VA 23708, USA