1. Division of Primary Care and Population Health, Department of Medicine, School of Medicine, Stanford University, Stanford, California
2. Department of Obstetrics and Gynecology, School of Medicine, Stanford University, Stanford, California
3. Office of the Surgeon General of the United States Army, Falls Church, Virginia
4. VA Palo Alto Health Care System, US Department of Veterans Affairs, Palo Alto, California
5. Department of Pediatrics, School of Medicine, Stanford University, Stanford, California