[1] Univ Groningen, Univ Med Ctr Groningen, Dept Surg, NL-9713 GZ Groningen, Netherlands
[2] Radboud Univ Nijmegen, Med Ctr, Dept Gastroenterol & Hepatol, NL-6525 ED Nijmegen, Netherlands
[3] Amsterdam Med Ctr, Nutr Support Team, Amsterdam, Netherlands
[4] Amsterdam Med Ctr, Dept Internal Med & Endocrinol, Amsterdam, Netherlands
[5] NHS Tayside, Ctr Managed Clin Networks, Dundee, Scotland
[6] Univ Groningen, Univ Med Ctr Groningen, Wenckebach Inst, NL-9713 GZ Groningen, Netherlands