Institution: | 1. Joint Program in Survey Methodology, University of Maryland at College Park, Maryland 20742, U.S.A.;2. Division of Cancer Epidemiology & Genetics, National Cancer Institute, Bethesda, Maryland 20892, U.S.A.;3. Measurement, Statistics & Evaluation, College of Education, University of Maryland at College Park, Maryland 20742, U.S.A. |