Measuring nutritional knowledge using Item Response Theory and its validity in European adolescents - Santos, Thanise Sabrina Souza; Michels, Nathalie; Huybrechts, Inge; Widhalm, Kurt; Molnar, Dénes; Marcos, Ascensión; Castillo-Garzón, Manuel J; Moreno, Luis A; Julian, Cristina; Andrade, Dalton Francisco de; Slater, Betzabeth; Piccinelli, Raffaela; et al. (Public Health Nutrition, 2018)