[1] Univ Calif Davis, Sacramento, CA USA
[2] Stanford Univ Sch Med, Palo Alto, CA USA
[3] Kaiser Permanente Northern Calif, Oakland, CA USA
[4] Permanente Med Grp Inc, Oakland, CA USA
[5] Stanford Univ, Stanford, CA USA
[6] Univ Calif, Davis, CA USA
[7] Kaiser Permanente Northern Calif, Oakland, CA USA