1. General & Digestive Surgery Service, La Paz University Hospital, 28046 Madrid, Spain
2. School of Medicine, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
3. Health Research Institute of the Balearic Islands, 07122 Palma de Mallorca, Spain
4. Department of General and Digestive Surgery, Virgen de la Arrixaca University Hospital, IMIB-Arrixaca, 30120 Murcia, Spain
5. Digestive and Endocrine Surgery and Transplantation of Abdominal Organs Research Group, Biomedical Research Institute of Murcia (IMIB), 30120 Murcia, Spain