Shakya, J. P. S., Agrawal, N., Kumar, A., Singh, A., Gogia, B. and Yadav, C. (2017) “A comparative study of the incidence of pain and infection in gall bladder extraction via umbilical and epigastric port”, International Surgery Journal, 4(2), pp. 747–750. doi: 10.18203/2349-2902.isj20170226.