1. Universitas Gadjah Mada; Department of Obstetrics and Gynaecology, Faculty of Medicine; DR.Sardjito Hospital Jl. Kesehatan No.1, Sekip Yogyakarta Daerah Istimewa Yogyakarta Indonesia 55281
2. National Center for Child Health and Development; Department of Health Policy; 2-10-1 Okura, Setagaya-ku Tokyo Japan 157-8535