Inclusion Criteria:  Independent Ethics Committee (IEC)-approved written informed consent/assent and privacy language as per national regulations must be voluntarily obtained from the subject. Premenopausal female subject, 18 to 45 years, inclusive Subject has moderate to severe endometriosis-related pain  Exclusion Criteria:  Subject has used hormonal contraceptives or other drugs with effects on gynecological endocrinology within 12 weeks Subject has been nonresponsive to GnRH-agonist or antagonist therapy for the management of endometriosis.