Hypovitaminosis D Among Patients Admitted With Hip Fracture to a Level-1 Trauma Center in the Sunny Upper Egypt oleh Osama Farouk MD, Dalia G. Mahran MD, Hatem G. Said MD, Mohamed M. Alaa MSc, Amr Atef Eisa MSc, Galal Z. Said MD, Heba Rashed MD, Azza Ez-Eldeen MD