Prevalence and risk factors of hearing impairment among primary-school children in Shebin El-Kom District, Egypt - Taha, A A; Pratt, S R; Farahat, T M; Abdel-Rasoul, G M; Albtanony, M A; Elrashiedy, A LE; Alwakeel, H R; Zein, A (Am J Audiol, 2010)