Affiliation: | 1. Division of Biostatistics, Office of Surveillance and Biometrics, Center for Devices and Radiological Health, U.S. Food and Drug Administration, Maryland 20993, U.S.A.;2. Department of Statistics, University of Florida, Florida 32601, U.S.A.;3. Department of Pharmaceutical Outcomes & Policy, Department of Epidemiology, University of Florida, Florida 32601, U.S.A. |