Institution: | Division of Cancer Epidemiology and Genetics, NCI, Rockville, Maryland 20892, U.S.A.;Information Management Services Inc, Rockville, Maryland 20892, U.S.A.;Academy of Mathematics and Systems Science, CAS, Beijing, P. R. China 100190;Molecular Genetics Program, Center for Health Sciences, SRI International, Menlo Park, California 94025, U.S.A.;Department of Biostatistics and Epidemiology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, U.S.A. |