1. Institute of Molecular Cancer Research, University of Zurich, Switzerland
2. Functional Genomics Center, University of Zurich, Switzerland
3. Endoscopy and Gastroenterology Unit, Hospital of Cremona, Italy
4. Department of Pathology, Poliambulanza Hospital Brescia, Brescia, Italy
5. Endoscopy and Gastroenterology Unit, Hospital A. Maresca of Torre del Greco, Italy
6. Laboratory of Cancer Genetics, Cancer Research Institute of Slovak Academy of Sciences, Bratislava, Slovakia
7. Department of Medical Genetics, St. Elizabeth Cancer Institute, Bratislava, Slovakia
8. Department of Pathology, Triemli Hospital Zurich, Switzerland