Lutfie, Lutfie, Nikko Darnindro, Imelda Maria Loho, Steven David Panggabean, Ryan Herardi, Pitt Akbar, Bhanu Kumar, and Rabbinu Rangga Pribadi. 2026. “The Role of Mastery Learning in Basic Skills in Upper Abdominal Ultrasound: Insights from a Comprehensive Training Workshop for Internists”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy 27 (2):134-40. https://doi.org/10.24871/2722026134-140.