TY - CONF AU - Macedo L. AU - Herbert Rob AU - Maher C. BT - Musculoskeletal Physiotherapy Australia - 14th Biennial Conference CY - Brisbane, Australia LA - eng LB - MS PP - Brisbane, Australia PY - 2005 T2 - Musculoskeletal Physiotherapy Australia - 14th Biennial Conference TI - The use of placebo controls in low back pain research: a systematic review ER -