A cluster randomised trial of an intervention to increase the implementation of physical activity practices in secondary schools: study protocol for scaling up the Physical Activity 4 Everyone (PA4E1) program

- Sutherland, Rachel; Campbell, Elizabeth; Williams, Mandy; Evans, Nicole; Bailey, Andrew; Morrison, Ross; McLaughlin, Matthew; Wiggers, John; Nathan, Nicole; Wolfenden, Luke; Lubans, David R.; Morgan, Philip J.; Gillham, Karen; Oldmeadow, Chris; Searles, Andrew; Reeves, Penny