aDepartment of Pathology, Gothenburg University, Gothenburg, Sweden;
bDepartment of Gastroenterology, Gasthuisberg University, Leuven, Belgium;
cDepartment of Gastroenterology, Ospedale S. Andrea, Rome, Italy;
dDepartment of Oncology, University of Texas, Houston, Tex., USA;
eDepartment of Endocrinology, Erlangen University, Erlangen, Germany;
fDepartment of Oncology and Pathology, Royal Infirmary Hospital, Glasgow, UK;
gDepartment of Oncology, Virgen de la Victoria Hospital, Malaga, Spain;
hDepartment of Nuclear Medicine, Medizinische Hochschule Hannover, Hannover, Germany;
iDepartment of Endocrinology, Erciyes University, Kayseri, Turkey;
jDepartment of Surgery, Beaujon Hospital, Clichy, France;
kDepartment of Nuclear Medicine, Catholique de Louvain University, Brussels, Belgium;
lDepartment of Nuclear Medicine, Erasmus MC University, Rotterdam, The Netherlands;
mDepartment of Gastroenterology, Royal Free Hospital, London, UK