After signing the informed consent, women will be asked to complete a baseline questionnaire to obtain information on demographic characteristics, medication history, and symptoms. A 10-centimeter (cm) visual analog scale and a validated endometriosis symptom questionnaire [the Endometriosis Health Profile-30 (EHP-30)] will also be administered to assess pain. The EHP-30 is an instrument specifically designed to measure pain and quality of life among women diagnosed with endometriosis. The EHP-30 consists of a core questionnaire with 30 items and five scales and six modular parts consisting of 23 questions. The EHP-30 has demonstrated both high reliability and validity.