Taregh, S.-A.- hagh, Hadavi, M.R., Omidvari, S. and Daneshforouz, M.A. 2015. Comparison of the analgesic effects of Post-operative Morphine, Pre-emptive and Post-operative Paracetamol in Septorhinoplasty Surgery. Galen Medical Journal. 4, 2 (May 2015), 121-25. DOI:https://doi.org/10.31661/gmj.v4i2.216.