Waseem Amjad, et al. “A Tough Scope to Swallow: Endoscopic Retrograde Cholangiopancreatography through Percutaneous Endoscopic Gastrostomy”. Turkish Journal of Gastroenterology, vol. 29, no. 1, July 2019, pp. 123-5, https://tjg.avesjournals.com/index.php/tjg/article/view/3498.