Affandi, Biran, H.M. Hoesni, R.P. Barus, Rizani Amran, Fitriani Iskandar, N.P. Noerpramono, Lila Dewata, et al. 1999. “A Multicentred Phase III Comparatiye Study Between Single-Implant Containing 3-Ketodesogestrel (Implanon®) and Implants Containing Levonorgestrel (Norplant®) I. Eff¯cacy, Acceptability and Safety (three-Year Results)”. Medical Journal of Indonesia 8 (1):49-55. https://doi.org/10.13181/mji.v8i1.677.