Relative validity of the Planetary Health Diet Index by comparison with usual nutrient intakes, plasma food consumption biomarkers, and adherence to the Mediterranean diet among European adolescents: the HELENA study - Cacau, Leandro Teixeira; Castillo, Manuel J; Molnár, Dénes; Widhalm, Kurt; Androutsos, Odysseas; Manios, Yannis; Stehle, Peter; Lachat, Carl; Marchioni, Dirce Maria Lobo; Moreno, Luis A; Hanley-Cook, Giles T; Huybrechts, Inge; et al. (European Journal of Nutrition, 2023)