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(2017) Comparing the effects of peritonsillar infiltration of tramadol before and after the surgery on post-tonsillectomy pain. European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery. ISSN 1434-4726