[1] Univ Amsterdam, Acad Med Ctr, Dept Surg, NL-1100 DD Amsterdam, Netherlands
[2] Univ Amsterdam, Acad Med Ctr, Dept Anesthesiol, NL-1100 DD Amsterdam, Netherlands
[3] Univ Amsterdam, Acad Med Ctr, Dept Qual Assurance & Proc Innovat, NL-1100 DD Amsterdam, Netherlands
[4] Red Cross Hosp, Dept Surg, Beverwijk, Netherlands
[5] Zaans Med Ctr, Dept Surg, Zaandam, Netherlands
[6] Onze Lieve Vrouw Hosp, Dept Surg, Amsterdam, Netherlands
[7] Sint Lucas Andreas Hosp, Dept Surg, Amsterdam, Netherlands
[8] Gelre Hosp, Dept Surg, Apeldoorn, Netherlands
[9] Tergooi Hosp, Dept Surg, Hilversum, Netherlands
[10] Univ Amsterdam, Acad Med Ctr, Dept Med Psychol, NL-1105 AZ Amsterdam, Netherlands
[11] Vrije Univ Amsterdam Med Ctr, Dept Surg, Amsterdam, Netherlands