ELDAWI AHMED, Eihab Abdel Rahim; MAHFOUZ, Mohamed Salih; OMER FDUL, Isam. How to determine Sample Size: the Design of Sample Size in Health Studies. Gezira Journal of Health Sciences, [S.l.], v. 7, n. 2, june 2011. ISSN 1810-5386. Available at: <http://37.60.236.48/index.php/gjhs/article/view/321>. Date accessed: 03 june 2026.