[1] Leiden Univ Med Ctr, Dutch Inst Clin Auditing, Leiden, Netherlands
[2] Leiden Univ Med Ctr, Dept Surg, Leiden, Netherlands
[3] Erasmus MC, Dept Surg, Rotterdam, Netherlands
[4] Acad Med Ctr, Dept Surg, Amsterdam, Netherlands
[5] Vrije Univ Amsterdam Med Ctr, Dept Pathol, Amsterdam, Netherlands
[6] Antoni van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Surg Oncol, Amsterdam, Netherlands
[7] Univ Med Ctr Utrecht, Dept Surg, Utrecht, Netherlands