Malik, D.M.I. et al. 2016. Otorhinolaryngology, Head and Neck Surgery Services in Khartoum State in Sudan 2015. International Journal of Innovative Research in Medical Science. 1, 06 (Aug. 2016), 238 to 245. DOI:https://doi.org/10.23958/ijirms/vol01-i06/03.