1. Analgesia and anesthesia in labour;Althaus;Obstetrics and Gynecology Clinics of North America,2005
2. Double-blind comparison of intravenous butorphanol (Stadol) and fentanyl (Sublimaze) for analgesia during labor;Atkinson;American Journal of Obstetrics and Gynecology,1994
3. Australian Government, NH&MRC Guidelines. 〈http://www.nhmrc.gov.au/publications/humansubcutaneouslyontents.htm〉 (last accessed 22/04/2008).
4. Effects of labor epidural analgesia with and without fentanyl in infant breastfeeding: a prospective, randomized, double-blind study;Beilin;Journal of the American Society of Anesthesiologists, Inc.,2005
5. Intranasal fentanyl reduces acute pain in children in the emergency department: a safety and efficacy study;Borland;Paediatric Emergency Medicine,2002