1. Department of General, Digestive and Endocrine surgery, Lyon Sud Hospital Centre, Pierre Bénite, France
2. Department of Thoracic and Endocrine Surgery and Faculty of Medicine, University Hospitals of Geneva, Geneva, Switzerland
3. Department of Pathology, Hospices Civils de Lyon, Lyon, France
4. Health Services and Performance Research Laboratory (EA 7425 HESPER), Université Claude Bernard, Lyon, France