Department of Epidemiology;
Harvard School of Public Health;
Department of Medical Oncology;
Hospital Clínic;
ICMHO;
IDIBAPS;
CIBEREHD;
University of Barcelona;
Interdisciplinary Tumor Center Mannheim and Ⅲ Medical Clinic;
University Hospital Mannheim;
University of Heidelberg;
Department of Gastroenterology;
Endoscopy Unit;
Hospital Clínic;
ICMDiM;
IDIBAPS;
CIBEREHD;
University of Barcelona;
Department of Radiology;
Hospital Clínic;
CDI;
IDIBAPS;
University of Barcelona;
Department of Pathology;
Hospital Clínic;
IDIBAPS;
University of Barcelona;
Department of Radiation Oncology;
Hospital Clínic;
ICMHO;
University of Barcelona;
Department of Gastrointestinal Surgery;
Hospital Clínic;
ICMDiM;
IDIBAPS;
CIBEREHD;
University of Barcelona;
Department of Gastroenterology;
Hospital Clínic;
ICMDiM;
IDIBAPS;
CIBEREHD;
University of Barcelona;
Department of Nursing and Health;
University of Applied Sciences of the Saarland;
Department for Hematology and Oncology;
Clinic for Internal Medicine Ⅱ;
Jena University Hospital;