Active relatives and health-related physical fitness in European adolescents: The HELENA Study - Martinez Gomez, David; Martin-Matillas, Miguel; Ortega, Francisco B; Ruiz, Jonatan R; Martinez-Gomez, David; Vicente-Rodriguez, German; Marcos, Ascension; Beghin, Laurent; Kafatos, Anthony; Gonzalez-Gross, Marcela; Zaccaria, Maria; Molnar, Denes; et al. (Journal Of Sports Sciences, 2012)