Gunardi ER, Affandi B. Serum levonorgestrel concentration and cervical mucus viscosity after six months of monoplant® implantation. Med J Indones [Internet]. 2014Mar.11 [cited 2024Apr.23];23(1):25-9. Available from: http://mji.ui.ac.id/journal/index.php/mji/article/view/685