ParticipACTION: awareness of the participACTION campaign among Canadian adults -- examining the knowledge gap hypothesis and a hierarchy-of-effects model. - Spence JC; Brawley LR; Craig CL; Plotnikoff RC; Tremblay MS; Bauman A; Faulkner GEJ; Chad K; Clark MI (International Journal of Behavioral Nutrition & Physical Activity, 2009)