VA Palo Alto Health Care System, Palo Alto Epidemiology Research and Information Center for Genomics, CA 94304, USA.|VA Palo Alto Health Care System, Palo Alto Epidemiology Research and Information Center for Genomics, CA 94304, USA.|Google, Mountain View, CA 94043, USA.|Department of Genetics.|Google, Mountain View, CA 94043, USA.|VA Palo Alto Health Care System, Palo Alto Epidemiology Research and Information Center for Genomics, CA 94304, USA.|VA Palo Alto Health Care System, Palo Alto Epidemiology Research and Information Center for Genomics, CA 94304, USA.