Affiliation: | 1. Kaiser Permanente Antioch Medical Center, Antioch, California;3. Kaiser Permanente Walnut Creek Medical Center, Walnut Creek, California;4. Division of Research, Kaiser Permanente Northern California, Oakland, California;6. Kaiser Permanente Santa Clara Medical Center, Santa Clara, California;5. Kaiser Permanente South San Francisco Medical Center, South San Francisco, California;7. Kaiser Permanente San Francisco Medical Center, San Francisco, California;12. Kaiser Permanente Oakland Medical Center, Oakland, California;8. Kaiser Permanente Sacramento Medical Center, Sacramento, California;10. Kaiser Permanente Northern California, Regional Pharmacy, Oakland, California;9. Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, Massachusetts |