1 General and Digestive Surgery Service: Hospital Universitario Son Espases, Palma de Mallorca, Spain.
2 General and Digestive Surgery Service: Hospital Universitario Son Espases, Palma de Mallorca, Spain; Faculty of Medicine, Universidad de las Islas Baleares, Palma de Mallorca, Spain; Health Research Institute of the Balearic Islands (IdISBa), Palma de Mallorca, Spain. Electronic address: Juan.segura@ssib.es.
3 General and Digestive Surgery Service: Hospital Universitario Son Espases, Palma de Mallorca, Spain; Health Research Institute of the Balearic Islands (IdISBa), Palma de Mallorca, Spain.