1. Biostatistics and Bioinformatics Branch; Division of Epidemiology; Statistics and Prevention Research; Eunice Kennedy Shriver National Institute of Child Health and Human Development; National Institutes of Health; Rockville; Maryland
2. Division of Biostatistics; University of Minnesota; Minneapolis; Minnesota
3. Department of Biostatistics; Mailman School of Public Health; Columbia University; New York; New York
4. Human Genetics Center; University of Texas - Houston; Houston; Texas