1. Kaiser Permanente Center for Health Research; Portland; OR USA
2. University of California San Francisco (UCSF); San Francisco; CA USA
3. Kaiser Permanente Southern California (KPSC); CA USA
4. Oregon Health & Science University (OHSU); Portland; OR USA
5. Kaiser Permanente Northwest; Portland; OR USA
6. Merck & Co., Inc., Kenilworth; NJ USA