Seasonal variation in expression of markers in the vitamin D pathway in prostate tissue Mara M. EpsteinOve AndrenJulie L. KasperzykIrene M. Shui • Kathryn L. PenneyKatja FallJennifer R. RiderMeir J. Stampfer • Swen-Olof AnderssonEdward GiovannucciLorelei A. Mucci