dx.doi.org/10.1017/S1368980019005251Sempos and Binkley. “25-Hydroxyvitamin D assay standardisation and vitamin D guidelines paralysis.” Public Health Nutrition (2020)Video produced by researchsquare.com 25HydroxyvitaminAssayGuidelinesnutritionParalysisstandardizationvideoVITAMINvitamin nutritionvlogYouTube