Efficacy of acupuncture for chronic knee pain: protocol for a randomised controlled trial using a Zelen design

- Hinman, Rana S.; McCrory, Paul; Novy, Kitty; Bennell, Kim L.; Pirotta, Marie; Relf, Ian; Crossley, Kay M.; Reddy, Prasuna; Forbes, Andrew; Harris, Anthony; Metcalf, Ben R.; Kyriakides, Mary