1. Department of Surgery; Catharina Hospital; Eindhoven The Netherlands
2. Eindhoven Cancer Registry; Comprehensive Cancer Centre South (IKZ); Eindhoven The Netherlands
3. Department of Surgery; St. Antonius Hospital; Nieuwegein The Netherlands
4. Department of Surgery; Jeroen Bosch Hospital's Hertogenbosch; The Netherlands
5. Department of Public Health; Erasmus MC University Medical Centre; Rotterdam The Netherlands