1. Section on Growth and Obesity, Division of Intramural ResearchEunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH) Bethesda Maryland USA
2. NICHD, NIH Bethesda Maryland USA
3. Department of Endocrinology, Diabetes and MetabolismJohns Hopkins School of Medicine Baltimore Maryland USA
4. Clinical Chemistry Service, Clinical Center, NIH Bethesda Maryland USA