BMC Public Health BMC Public Health Effectiveness of a primary care-based intervention to reduce sitting time in overweight and obese patients (SEDESTACTIV): a randomized controlled trial; rationale and study design Martín-Borràs C Giné-Garriga M Martínez E Martín-Cantera C Puigdoménech E Solà M Castillo E Beltrán A Puig-Ribera A Trujillo JM Pueyo O Pueyo J Rodríguez B Serra-Paya N SEDESTACTIV Study Group. Gastón Catalán Ana María Universidad de Zaragoza 2014 research-article