Taghavi, Seyed Alireza, et al. “Prevalence of IgG-4-Associated Cholangiopathy Based on Serum IgG-4 Levels in Patients With Primary Sclerosing Cholangitis and Its Relationship With Inflammatory Bowel Disease”. Turkish Journal of Gastroenterology, vol. 27, no. 6, Jan. 2016, pp. 547-52, doi:10.5152/tjg.2016.16344.