1. Department of Engineering, King’s College London, London WC2R 2LS, UK
2. Centre for Chiropractic Research, New Zealand College of Chiropractic, 6 Harisson Road, Mount Wallington, Auckland 1060, New Zealand
3. Faculté de Médecine, Université de Kindu, Site de Lwama II, Kindu, Maniema, Congo