1. Doctoral Program, School of Public Health University of Sumatera Utara, Medan 20155, Indonesia
2. Department of Nutrition, Faculty of Medicine, University of Sumatera Utara, Medan 20155, Indonesia
3. Department of Internal Medicine Faculty of Medicine, University of Sumatera Utara, Medan 20155, Indonesia
4. Department of Demography and Biostatistics, Faculty of Public Health, University of Sumatera Utara, Medan 20155, Indonesia