1. Department of Emergency Surgery, Policlinico Universitario “Duilio Casula,” Azienda Ospedaliero-Universitaria di Cagliari, University of Cagliari, Cagliari, Italy
2. Department of General and Trauma Surgery, Brighton and Sussex University Hospital NHS Trust, Brighton, UK
3. Department of General Surgery, University of Insubria, University Hospital of Varese, ASST Sette Laghi, Varese, Italy