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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 (Mar. 2023). DOI:https://doi.org/10.12669/pjms.39.3.6777.