1. practice-bulletin-no-152-2015.
2. The rationale for use of Ulipristal Acetate as first line in emergency contraception: biological and clinical evidence;Glasier;Gynecol Endocrinol,2014
3. Cleland K, Raymond EG, Westley E, Trussell J. Emergency Contraception Review: Evidence-based Recommendations for Clinicians [Internet]. Available from: www.clinicalobgyn.com.
4. Pregnancy risk by frequency and timing of unprotected intercourse before intrauterine device placement for emergency contraception;Bakenra;Obstet Gynecol,2021