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Document Type: Research Article
Affiliations: 1: Department of Biostatistics, Mailman School of Public Health, Columbia University, 630 West 168th Street, New York, New York 10032, U.S.A., Email: email@example.com 2: Department of Biostatistics, Box 447, M. D. Anderson Cancer Center, University of Texas, 1515 Holcombe Boulevard, Houston, Texas 77030, U.S.A.
Publication date: March 1, 2002