1. Pain management for medical abortion before 14 weeks’ gestation: a systematic review;Reynolds-Wright;Contraception,2022
2. Medication abortion up to 70 days of gestation: ACOG practice bulletin, number 225;Creinin;Obstetr Gynecol,2020
3. U.S. Food and Drug Administration. Methadone hydrochloride. 〈https://www.accessdata.fda.gov/drugsatfda_docs/label/2018/006134s045lbl.pdf〉; 2018 [accessed 5 May 2022].
4. The assessment and treatment of addiction: best practices and new frontiers;Danovitch,2018
5. Methadone for cancer pain;Nicholson;Cochrane Database Syst Rev,2017