Al-Horani, Hanan Nationality, Gender, Age, and Body Mass Index Influences on Vitamin D Concentration among Elderly Patients and Young Iraqi and Jordanian in Jordan. [electronic resource] - Biochemistry research international 2016 - 8920503 p. digital Publication Type: Journal Article ISSN: 2090-2247 Standard No.: 10.1155/2016/8920503 doi