Affiliation: | (1) Department of Medicine, Kaiser Permanente San Francisco Medical Center, San Francisco, CA, USA;(2) Department of Orthopedic Surgery, Kaiser Permanente Oakland Medical Center, Oakland, CA, USA;(3) Division of Research, Kaiser Permanente Northern California, 2000 Broadway, Oakland, CA 94612, USA;(4) Department of Medicine, Kaiser Permanente Oakland Medical Center, Oakland, CA, USA; |