1. Department of Midwifery, Institute Technology, Sains and Health RS Dr. Soepraoen, Malang City, East Java, Indonesia
2. Department of Health Promotion and Behavioral Sciences, Faculty of Public Health, Airlangga University, Surabaya, East Java, Indonesia
3. Department of Obstetrics and Gynecology, Faculty of Medicine, Airlangga University, Surabaya, East Java, Indonesia
4. Department of Biostatistics and Population Study, Faculty of Public Health, Universitas Airlangga, Surabaya, East Java, Indonesia