1. Khon Kaen University; Department of Obstetrics and Gynaecology, Faculty of Medicine; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002
2. The University of Auckland; Liggins Institute; Park Road Grafton Auckland New Zealand 1142
3. Khon Kaen University; Department of Epidemiology and Biostatistics, Faculty of Public Health; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002
4. World Health Organization; Department of Reproductive Health and Research; Geneva Switzerland
5. Penang Medical College; Department of Paediatrics; 4 Sepoy Lines Penang Malaysia 10450
6. Universitas Gadjah Mada; Department of Obstetrics and Gynaecology, Faculty of Medicine; Jl. Farmako, Sekip Yogyakarta Daerah Istimewa Yogyakarta Indonesia 55281