Al-Sarraf, Salem A.H., Safa M. Al-Obaidi, and Muqdad F.A. Al-karim. 2008. “Abdominal Operations Without Nasogastric Tube :A Major Advance in Modern Surgery”. Journal of the Faculty of Medicine Baghdad 50 (3): 303-7. https://doi.org/10.32007/jfacmedbagdad.5031246.