Anaesthesia for laparoscopy: alfentanil and fentanyl compared.
D015760:Alfentanil; D000700:Analgesics; D005283:Fentanyl / Q000031:analogs & derivatives; D006801:Humans; D010535:Laparoscopy
D000700:Analgesics; D015760:Alfentanil; D005283:Fentanyl