Contextual factors predict the outcome of low back pain therapies: a large prospective questionnaire study in physiotherapy, osteopathy, and acupuncture. (May 2019) - Bishop, Felicity; Al-Abbadey, Miznah; Roberts, Lisa; MacPherson, Hugh; Stuart, Beth; Yardley, Lucy; Carnes, Dawn; Fawkes, Carol; Bradbury, Katherine