Department of Gastroenterolog Radboud University Nijmegen Medical Center;
PO Box 9106500 HB Nijmegen;
The Netherlands;
Department of Surgery;
Radboud UniversityNijmegen Medical Center;
PO Box 9101;
6500 HB Nijmegen;
The Netherlands;
Department of Gastroenterology;
Hospital Gelderse Vallei;
PO Box 9025;
6710 HN;
Ede;
The Netherlands;
Department of Gastroenterology;
Canisius Wilhelmina Hospital;
Weg door Jonkerbos 100;
6532 SZ;
Nijmegen;
The Netherlands;