1. Division of Sociomedical Sciences, Department of Preventive Medicine and Community Health, The University of Texas Medical Branch at Galveston
2. Division of Biostatistics, HFN-715, Center of Drugs and Biologics, Food and Drug Administration, Rockville, Maryland
3. Division of Epidemiology and Biostatistics, Department of Preventive Medicine and Community Health, The University of Texas Medical Branch at Galveston