1. Musculoskeletal Division; The George Institute for Global Health, Sydney Medical School, University of Sydney; Sydney Australia
2. Department of Chiropractic; Faculty of Science and Engineering, Macquarie University; Sydney Australia
3. Institute of Public Health, Heidelberg Medical School; University of Heidelberg; Heidelberg Germany
4. Department of Epidemiology and Biostatistics; EMGO+ Institute, VU University Medical Center; Amsterdam The Netherlands
5. Department of Public Health and Epidemiology; Riga Stradinš University, Latvia
6. Department of Child and Adolescent Psychiatry; Research Unit Child Public Health, University Medical Center Hamburg-Eppendorf; Hamburg Germany