Department of Family and Preventive Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America.|Department of Family and Preventive Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America.|Department of Family and Preventive Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America.|Department of Family and Preventive Medicine, School of Medicine, University of California San Diego, La Jolla, California, United States of America.