Progression of diabetic nephropathy and vitamin D serum levels: A pooled analysis of 7722 patients oleh Yomna E. Dean, Sameh Samir Elawady, Wangpan Shi, Ahmed A. Salem, Arinnan Chotwatanapong, Haya Ashraf, Tharun Reddi, Prashant Obed Reddy Dundi, Waleed Yasser Habash, Mohamed Yasser Habash, Safaa Ahmed, Hana M. Samir, Ahmed Elsayed, Aryan Arora, Abhinav Arora, Abdelrahman Elsayed, Tamer Mady, Yousef Tanas, Yusef Hazimeh, Mohamed Alazmy, Hani Aiash