Perna, LHaug, USchöttker, BMueller, HRaum, EJansen, EHJMBrenner, H2025-03-212025-03-2120122274329410.1016/j.ypmed.2012.06.010https://rivm.openrepository.com/handle/10029/646488Public health implications of standardized 25-hydroxyvitamin D levels: a decrease in the prevalence of vitamin D deficiency among older women in GermanyArticlePrev Med 2012; 55(3):228-322025-03-21