A three-year follow-up of women with endometriosis and pelvic pain (CPP) randomly assigned to a Levonorgestrel-releasing intrauterine system (LNG-IUS) or a depot GnRH analogue - Petta, C.; Ferriani, Rui Alberto; Abrão, M.; Hassan, D.; Rosa e Silva, Júlio César; Podgaec, S.; Bahamondes, L. (World Congress on Endometriosis, 2008)