Gupta, G., Sharma, P.K., Gupta, S. and Bhardwaj, A. 2017. Pre and per operative prediction of difficult laparoscopic cholecystectomy using clinical and ultrasonographic parameters. International Journal of Research in Medical Sciences. 3, 11 (Jan. 2017), 3342–3346. DOI:https://doi.org/10.18203/2320-6012.ijrms20151188.