Jungert A., Spinneker A., Nagel A. and Neuhäuser-Berthold M. 2014. Dietary intake and main food sources of vitamin D as a function of age, sex, vitamin D status, body composition and income in an elderly German cohort. Food & Nutrition Research. (Sep. 2014). DOI:https://doi.org/10.3402/fnr.v58.23632.