H. I. Alhumaid, A. S. Abou-halawa, M. A. Khan, N. S. Al-Hamamah, S. A. Al Duways, and A. M. Alanazi, “Prevalence and risk factors of Otitis Media with effusion in school children in Qassim Region of Saudi Arabia”, IJHS, vol. 8, no. 4, Jan. 2015.