[1] Univ Dongola, Fac Med & Hlth Sci, Denpasar, Northern State, Indonesia
[2] Univ Dongola, Fac Med & Hlth Sci, Dept Med, Dongola, Northern State, Sudan
[3] Fed Minist Hlth, Khartoum, Sudan
[4] Univ Bisha, Coll Med, Dept Community Med, Bisha, Saudi Arabia
[5] King Saud Univ, Coll Med, Prince Abdullah Bin Khaled Coeliac Dis Res Chair, Riyadh, Saudi Arabia