1. Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine; Brigham and Women's Hospital and Harvard Medical School; Boston MA USA
2. Division of Research, Kaiser Permanente Northern California; Oakland CA USA
3. Johnson & Johnson; Titusville NJ USA
4. Department of Anesthesiology, Pharmacology and Therapeutics; University of British Columbia; Vancouver BC Canada
5. Pharmaceutical Services Division; BC Ministry of Health Services; Victoria BC Canada
6. Ernest Mario School of Pharmacy, Rutgers; The State University of New Jersey; New Brunswick NJ USA
7. Department of Population Medicine; Harvard Medical School and Harvard Pilgrim Healthcare Institute; Boston MA USA
8. Biostatistics Unit, Group Health Research Institute; Seattle WA USA
9. Department of Biostatistics; University of Washington; Seattle WA USA