From Service Burden to Burnout: The Protective Role of Supervisory Support Among Internal Medicine Postgraduate Residents in Punjab Teaching Hospitals A Cross-Sectional Survey Running head: Service burden, supervisory support, and burnout in Punjab Intern. (2026). Pakistan Journal of Medical & Cardiological Review, 5(2), 6501-6517. https://doi.org/10.66021/pakmcr1381