1. Department of Midwifery, MoH Health Polytechnic of Tanjung Karang, Lampung, Indonesia.
2. Azizah Hospital, Kota Metro, Lampung, Indonesia.
3. Midwifery Academy of Patriot Bangsa Husada, Lampung Tengah, Lampung, Indonesia.
4. Department of Biology, Faculty of Mathematics and Sciences, University of Lampung, Bandar Lampung, Indonesia.