1. University of Oxford; Department of Public Health; Rosemary Rue Building Old Road Campus Headington Oxford UK OX3 7LF
2. University of Modena and Reggio Emilia; Department of Oncology, Hematology and Respiratory Diseases; Via del Pozzo 71 Modena Italy 41100
3. Cleveland Clinic; Department of Plastic Surgery; Cleveland Ohio USA
4. The University of New South Wales; School of Public Health and Community Medicine; Sydney NSW Australia 2052
5. McMaster University; School of Rehabilitation Science, Institute for Applied Health Sciences, Faculty of Health Sciences; 1400 Main Street West Room 403 Hamilton Ontario Canada L8S 1C7
6. Ottawa Health Research Institute; Clinical Epidemiology Program; 1053 Carling Avenue Ottawa ON Canada K1Y 4E9
7. Newcastle University; Institute of Health and Society; Badiley Clark Building Richardson Road Newcastle upon Tyne UK NE2 4AX