1. Progestin-only contraception;Beck;West J Med,1991
2. ClinicalTrials.gov. Study in women with idiopathic menorrhagia to determine the reduction in menstrual blood loss (MBL) after treatment with the levonorgestrel-releasing intrauterine system (IUS). Available at: https://clinicaltrials.gov/ct2/show/study/NCT00360490. Identifier: NCT00360490. Accessed June 25, 2011.
3. Acceptability of the levonorgestrel-releasing intrauterine system after discontinuation of previous contraception: results of a French clinical study in women aged 35 to 45 years;Dubuisson;Contraception,2002
4. Hormonal contraceptives and acne: a retrospective analysis of 2147 patients;Lortscher;J Drugs Dermatol,2016
5. Levonorgestrel-releasing intrauterine system and new-onset acne;Ilse;Cutis,2008