Affiliation: | (1) Department of Family Medicine, University of California Irvine Medical Center, 101 City Drive South, Rte 81, Bldg 200, Suite 512, Orange, Irvine, California 92868, USA;(2) Georgetown University School of Medicine, Washington, DC, USA;(3) Veterans Affairs Palo Alto Health Care System, Stanford University School of Medicine, Stanford, CA, USA |