Association of serum 25-hydroxyvitamin D concentrations with sleep phenotypes in a German community sample Dogan-Sander, Ezgi ; Willenberg, Anja ; Batmaz, İnci ; Enzenbach, Cornelia ; Wirkner, Kerstin ; Kohls, Elisabeth ; Mergl, Roland ; Thiery, Joachim ; Kratzsch, Jürgen ; Hegerl, Ulrich ; Sander, Christian Abstract Publication: PLoS ONE Pub Date: July 2019 DOI: 10.1371/journal.pone.0219318 Bibcode: 2019PLoSO..1419318D