1 Department of Surgery, Papageorgiou General Hospital, Thessaloniki, Greece. stavros.antoniou@hotmail.com.
2 Department of Primary Education, School of Education University of Ioannina, Ioannina, Greece.
3 Paris Descartes University, Sorbonne Paris Cité, Faculté de Médecine, Paris, France.
4 Unit of Innovation in Minimally Invasive Surgery, Department of General and Digestive Surgery, University Hospital "Virgen del Rocio", University of Sevilla, Seville, Spain.