1. Department Nuffield of Orthopaedics, Rheumatology & Musculoskeletal Sciences UK EQUATOR Centre Centre for Statistics in Medicine University of Oxford Oxford UK
2. Department of Health Research Methods Evidence and Impact McMaster University Hamilton Ontario Canada
3. Department of Pediatrics University of Antioquia Medellin Colombia
4. Department of Vascular and Endovascular Surgery Manchester University NHS Foundation Trust Manchester UK
5. Division of Cardiovascular Sciences School of Medical Sciences The University of Manchester Manchester UK
6. Nuffield Department of Surgery University of Oxford Oxford Oxfordshire UK
7. Department of Molecular Medicine and Surgery Karolinska Institute Stockholm Sweden
8. Abdominal Wall Surgery Unit Val d’ Hebrón University Hospital Universidad Autónoma de Barcelona Barcelona Spain
9. Department of Medico‐Surgical Sciences and Translation Medicine Faculty of Medicine and Psychology Sapienza University of Rome Rome Italy
10. Department of Primary Education School of Education University of Ioannina Ioannina Greece
11. Paris Descartes University Sorbonne Paris Cité Faculté de Médecine Paris France
12. Department of Surgery Mediterranean Hospital of Cyprus Limassol Cyprus
13. European University Cyprus Nicosia Cyprus