Muhammad Ayub Naich, Sagheer Hussain, Adeel Qamar, Hina Zamir, Zia Ul Mustafa, Fatima Cheema (2022) “Evaluation of Different Types of Gallstones Extracted by Endoscopic Retrograde Cholangiopancreatography”, Pakistan Journal of Medical & Health Sciences, 16(11), p. 191. doi: 10.53350/pjmhs20221611191.