Lutfie, L.; Darnindro, N.; Loho, I. M.; Panggabean, S. D.; Herardi, R.; Akbar, P.; Kumar, B.; Pribadi, R. R. The Role of Mastery Learning in Basic Skills in Upper Abdominal Ultrasound: Insights from a Comprehensive Training Workshop for Internists. InaJGHE 2026, 27, 134-140.