Affiliation: | 1. Department of Pediatrics, Stanford University School of Medicine, , Palo Alto, CA;2. Department of Medicine, Stanford University School of Medicine, , Palo Alto, CA;3. Department of Obstetrics and Gynecology, Stanford University School of Medicine, , Palo Alto, CA;4. Health Economics Resource Center, VA Palo Alto Health Care System, , Palo Alto, CA |