1. Department of Surgery, Hospital Universitari del Mar, Universitat Autònoma de Barcelona, Spain
2. Medicine Interne, Clinique ‘Résidence du Parc’, Marseille, France
3. Hospital Gregorio Marañón, Madrid, Spain
4. Arantzazuko Amaren Ospitalea, Donosti, Spain
5. Centre Hospitalari de Manresa, Spain