1 Department of Surgery, Mediterranean Hospital of Cyprus, Limassol, Cyprus. stavros.antoniou@hotmail.com.
2 European University Cyprus, Nicosia, Cyprus. stavros.antoniou@hotmail.com.
3 Department of Health Research Methods, Evidence and Impact, McMaster University, Hamilton, ON, Canada.
4 Department of Pediatrics, University of Antioquia, Medellin, Colombia.
5 Nuffield Department of Surgery, University of Oxford, Oxford, UK.
6 Department of Molecular Medicine and Surgery, Karolinska Institute, Stockholm, Sweden.
7 UK EQUATOR Centre, Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK.
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 Vascular and Endovascular Surgery, Manchester University NHS Foundation Trust, Manchester, UK.
11 Division of Cardiovascular Sciences, School of Medical Sciences, The University of Manchester, Manchester, UK.
12 Department of Primary Education, School of Education, University of Ioannina, Ioannina, Greece.
13 Paris Descartes University, Sorbonne Paris Cité, Faculté de Médecine, Paris, France.