1. Department of Surgery, Rene Gauducheau Comprehensive Cancer Centre, Nantes Saint Herblain, France
2. Department of Medicoeconomics, Claudius Regaud Comprehensive Cancer Centre, Toulouse, France
3. Department of Medicoeconomics, Comprehensive Cancer Centre, Rene Gauducheau, Nantes Saint Herblain, France
4. Department of Anaesthesiology, Comprehensive Cancer Centre, Rene Gauducheau, Nantes Saint Herblain, France