U. S. Khan, A. Amjad, M. U. Naeem, F. Saleem, A. Ali, and A. Safdar, “Evaluation of Serum Vitamin D Levels and its Association with Increased Risk of Pressure Ulcer among Non-Ambulatory Patients”, JHRR, vol. 4, no. 2, pp. 922–926, May 2024.