Rueankhong, W., S. Suthutvoravut, and J. Tangthitiwong. “Factors Associated With the Use of Subdermal Etonogestrel Implants Among Postpartum Primipara Adolescents”. Ramathibodi Medical Journal, vol. 41, no. 1, Mar. 2018, pp. 9-16, doi:10.14456/rmj.2018.2.