What is the relationship between parental support, self-efficacy and physical activity in young students? A pilot cross-sectional studyAlberto Ruiz-Ariza, Manuel de la Torre-Cruz, Sebastián López-Serrano and Emilio J. Martínez-LópezSHS Web Conf., 37 (2017) 01002DOI: https://doi.org/10.1051/shsconf/20173701002