Seasonal variation in vitamin D status in elite athletes: A longitudinal study - Backx, E.; van der Avoort, C.; Tieland, M.; Maase, K.; Kies, A.; van Loon, L.; de Groot, L.; Mensink, M. (International Journal of Sport Nutrition and Exercise Metabolism, 2017)
Keywords: nutrition; supplementation; vitamin; high performance sport; elite sport; preparation period; competition period; winter; summer; USA; biological and medical sciences