1. Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853-6301
2. Clinical Epidemiology and Biostatistics Unit, Gadjah Mada University, Yogyakarta 55001, Indonesia
3. Biochemistry Laboratory, Faculty of Medicine, Gadjah Mada University, Yogyakarta 55001, Indonesia
4. Division of Human Nutrition, Department of International Health, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205