1 Department of Surgery, Regional Academic Cancer Center Utrecht, St Antonius Hospital Nieuwegein and University Medical Center Utrecht, Utrecht 3508, Netherlands; Department of Surgery, Diakonessenhuis, Utrecht, Netherlands.
2 Department of Surgery, Regional Academic Cancer Center Utrecht, St Antonius Hospital Nieuwegein and University Medical Center Utrecht, Utrecht 3508, Netherlands.
3 Department of Surgery, Regional Academic Cancer Center Utrecht, St Antonius Hospital Nieuwegein and University Medical Center Utrecht, Utrecht 3508, Netherlands. Electronic address: h.vansantvoort@umcutrecht.nl.