| Affiliation: | 1. Biostatistics Unit, Group Health Research Institute, Seattle, Washington, U.S.A.;2. Department of Biostatistics, University of Washington, School of Public Health, Seattle, Washington, U.S.A.;3. Department of Biostatistics and Computational Biology, University of Rochester, Rochester, New York, U.S.A.;4. Department of Statistics, The Wharton School, University of Pennsylvania Center for Pharmacoepidemiology Research and Training, University of Pennsylvania, Philadelphia, Pennsylvania, U.S.A. |
