Tariq Nawaz, Muhammad Waqas Ayub, Amjad Umair, Atif Khan, Qasim Ali , Faisal Murad, Idrees Anwar 2016. Comparison Between Veress Needle (Closed)Technique and Open Technique in Laparoscopic Cholecystectomy. Journal of Rawalpindi Medical College. 20, 2 (Jun. 2016).