1. 1Department of Biochemistry, College of Medicine and Health Sciences , Al-Neelain University, Sudan. National University, Oman.
2. 2Department of Medical Laboratory Sciences, College of Applied Medical Sciences, Prince Sattam Bin Abdulaziz University- Al-Kharj, Riyadh, KSA.
3. 3Department of Public Health and Biostatistics, College of Medicine and Health Sciences, National University, Oman.
4. 4Department of Community Medicine, Sri Venkateshwara Medical College, India.