Khan, R. S. A., Alam, L., Saeed, F., Sher, F. and Khan, R. Z. A. (2023) “Does early application of needle-knife sphincterotomy (NKS) in patients with difficult biliary cannulation increase the risk of postERCP pancreatitis? A single centre study”, Pakistan Journal of Medical Sciences, 39(3). doi: 10.12669/pjms.39.3.6777.