H. Afridi, S. Rasul, R. Wakil, R. Ali, M. Afzal, and C. Effendi, “Frequency and intraoperative reasons leading to conversion of laparoscopic cholecystectomy to open cholecystectomy in a tertiary care hospital at Karachi”, J Pak Med Assoc, vol. 76, no. 10, pp. 1685–1688, Oct. 2026.