Effectiveness of a healthy lifestyle intervention for low back pain and osteoarthritis of the knee: protocol and statistical analysis plan for two randomised controlled trials

- O'Brien, Kate M.; Williams, Amanda; Williams, Christopher M.; Wiggers, John; Wolfenden, Luke; Yoong, Serene; Campbell, Elizabeth; Kamper, Steven J.; McAuley, James; Attia, John; Oldmeadow, Chris