Muhammad Aasim Khan, Mohammad Hanif, Kapeel Raja, Naeem Abbas Gilani, Amanullah Khokhar, Amjad Ali, “A Multicenter Cross Sectional Study to Evaluate the Role of Duodenal Bulb Biopsy in the Diagnosis of Celiac Disease”, Pakistan Journal of Medical & Health Sciences, vol. 16, no. 05, p. 1009, Jul. 2022.