Maslekar, S Randomized clinical trial of Entonox versus midazolam-fentanyl sedation for colonoscopy. [electronic resource] - The British journal of surgery Apr 2009 - 361-8 p. digital Publication Type: Comparative Study; Journal Article; Randomized Controlled Trial ISSN: 1365-2168 Standard No.: 10.1002/bjs.6467 doi Subjects--Topical Terms: Administration, InhalationAdultAgedAnesthetics, CombinedAttitude of Health PersonnelColonoscopy--methodsFemaleFentanylHumansInfusions, IntravenousMaleMidazolamMiddle AgedNitrous OxideOxygenPain--etiologyPatient SatisfactionPsychomotor Performance--drug effectsRecovery of Function