Saleh A. J., Zhang L., Hadi S. M., & Ouyang W. (2014). A priming dose of intravenous ketamine-dexmedetomidine suppresses fentanyl-induced coughing: A double-blind, randomized, controlled study. Upsala Journal of Medical Sciences, 119(4), 333–337. https://doi.org/10.3109/03009734.2014.968270