Morotti M, Sozzi F, Remorgida V, Venturini PL, Ferrero S. Dienogest in women with persistent endometriosis-related pelvic pain during norethisterone acetate treatment. Eur J Obstet Gynecol Reprod Biol 2014;183:188-192. https://www.ejog.org/article/S0301-2115(14)00560-0/fulltext