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Reda Fawzy Ali; Khalid Ahmed Ismail; Taha Ahmed Ismail; Ahmed Lamey Ahmed Saleh; Ahmed Mahmoud Aouf; Mohamed Ahmed Tolba ElKhopy. Effect of Laparoscopic Sleeve Gastrectomy on Vitamin D, Parathormone Hormone, and Serum Calcium Levels. J Pak Med Assoc 2023, 73, S174-S178.