Sezgin, Gulbuz Vitamin D Levels of Outpatients Admitted to a University Hospital in the Marmara Region of Turkey Over 3 Years. [electronic resource] - Journal of medical biochemistry Apr 2019 - 181-187 p. digital Publication Type: Journal Article ISSN: 1452-8258 Standard No.: 10.2478/jomb-2018-0027 doi