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SUSAN S. ELLENBERG, PHD, is Professor of Biostatistics, Department of Biostatistics, Epidemiology and Informatics, University of Pennsylvania Perelman School of Medicine, USA. THOMAS R. FLEMING, PHD, is Professor of Biostatistics and Statistics, Department of Biostatistics, School of Public Health, University of Washington, USA. DAVID L. DEMETS, PHD, is Professor Emeritus and Founding Chair of the Department of Biostatistics and Medical Informatics, University of Wisconsin?Madison, USA.
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