1. Novartis Institutes for Biomedical Research, Developmental and Molecular Pathways, Novartis Pharma AG; Basel Switzerland
2. Division of Gastroenterology and Hepatology; University Hospital Basel; Basel Switzerland
3. Novartis Institutes for Biomedical Research, Oncology, Novartis Pharma AG; Basel Switzerland
4. Institute for Pathology, University Hospital Basel; Basel Switzerland