PunA., DhunganaA., PariyarJ., & UpadhyayH. P. (2021). Effectiveness of Fentanyl in Facilitating Cannulation of Ampulla of Vater during Endoscopic Retrograde Cholangiopancreatography. Journal of Nepal Health Research Council, 18(4), 753-757. https://doi.org/10.33314/jnhrc.v18i4.3267