1. Faculty of Public Health, Khon Kaen University; Department of Nutrition; 123 Friendship Highway Khon Kaen Khon Kaen Thailand 40002
2. World Health Organization; Department of Reproductive Health and Research; Avenue Appia 20 Geneva Switzerland 1201
3. Khon Kaen University; Department of Obstetrics and Gynaecology, Faculty of Medicine; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002
4. Khon Kaen University; Department of Biostatistics and Demography, Faculty of Public Health; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002