1. From the Office of Dietary Supplements (RLB, EAY, JTD, CTS, JMB, and MFP), the Division of Epidemiology, Statistics, and Prevention Research, Eunice Kennedy Shriver National Institute of Child and Human Development (JLM), and the National Cancer Institute (KWD), National Institutes of Health, Bethesda, MD; the National Center for Health Statistics, Centers for Disease Control and Prevention, Hyat