Front. psychol. Front. psychol. Efficacy of 8- and 4-session mindfulness-based interventions in a non-clinical population: A controlled study Demarzo M. Montero-Marin J. Puebla-Guedea M. Navarro-Gil M. Herrera-Mercadal P. Universidad de Zaragoza Moreno-González S. Calvo-Carrión S. Bafaluy-Franch L. Garcia-Campayo J. Universidad de Zaragoza 2017 research-article