1. Association between contemporary hormonal contraception and ovarian cancer in women of reproductive age in Denmark: prospective, nationwide cohort study;Iversen;British Medical Association Journal,2018
2. Institute for Quality and Efficiency in Health Care [IQWIH]. (2017). Contraception: hormonal contraceptives; 2006. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK441576/
3. Cooper, D.B., & Mahdy, H. (2020). Oral contraceptive pills. StatPearls [Internet]. Retrieved from https://www.ncbi.nlm.nih.gov/books/NBK430882/
4. Contraceptive methods women have ever used: United States, 1982-2010;Daniels;National Health Statistic Report,2013
5. Non-Contraceptive Benefits of Oral Hormonal Contraceptives;Schindler;International Journal of Endocrinology Metabolism,2010