Factors associated with serum 25-hydroxyvitamin D concentrations in older people in Europe: the EUREYE study.

Eur J Clin Nutr. 2019;73:319-328

Casey C, Woodside JV, McGinty A, Young IS, McPeake J, Chakravarthy U, Rahu M, Seland J, Soubrane G, Tomazzoli L, Topouzis F, Vioque J, Fletcher AE