Heinemann K, Reed S, Moehner S, Minh TD. Risk of uterine perforation with levonorgestrel-releasing and copper intrauterine devices in the European Active Surveillance Study on Intrauterine Devices. Contraception 2015;91(4):274–9. https://www.ncbi.nlm.nih.gov/pubmed/25601352
Labbok MH, Hight-Laukaran V, Peterson AE, Fletcher V, von Hertzen H, Van Look PF. Multicenter study of the Lactational Amenorrhea Method (LAM): I. Efficacy, duration, and implications for clinical application. Contraception 1997;55(6):327–36. https://www.ncbi.nlm.nih.gov/pubmed/9262927
Liew DF, Ng CS, Yong YM, Ratnam SS. Long-term effects of Depo-Provera on carbohydrate and lipid metabolism. Contraception 1985;31(1):51–64. https://www.ncbi.nlm.nih.gov/pubmed/3157546