Endometriosis in Patients with Chronic Pelvic Pain: Is Staging Predictive of the Efficacy of Laparoscopic Surgery in Pain Relief? - Milingos, Spyros; Protopapas, Athanasios; Kallipolitis, George; Drakakis, Petros; Loutradis, Dimitrios; Liapi, Anthoula; Antsaklis, Aris (Gynecologic & Obstetric Investigation, 2006)