with physical fitness in adolescents: the HELENA study Iron and vitamin status biomarkers and its association

Gonzalez-Gross and on behalf of the HELENA Study GroupGiuseppe Maiani, Peter Stehle, Manuel J. Castillo, Luis A. Moreno, MarcelaWidhalm, Stefaan de Henauw, Anthony Kafatos, Ligia E. Diaz, Frederic Gottrand, German Vicente-Rodriguez, Christina Breidenassel, Marika Ferrari, Denes Molnar, KurtLuis Gracia-Marco, Jara Valtuena, Francisco B. Ortega, Faustino R. Perez-Lopez,