Ravi Keshari. “EVALUATION OF MALIGNANT BILIARY TRACT STRICTURES WITH ENDOSCOPIC RETROGRADE CHOLANGIOPANCREATOGRAPHY GUIDED BRUSH CYTOLOGY”. Journal of Population Therapeutics and Clinical Pharmacology, vol. 30, no. 17, Aug. 2023, pp. 527-34, https://doi.org/10.53555/jptcp.v30i17.2478.