1. Department of Medical Epidemiology and Biostatistics and
2. Center for Digestive Diseases
3. Division of Surgery, CLINTEC, and
4. Department of Biosciences and Nutrition and Center for Innovative Medicine (CIMED), Karolinska Institutet, Huddinge, Sweden
5. Division of Pathology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
6. Clinical Pathology/Cytology, Karolinska University Hospital, Stockholm, Sweden
7. Department of Pathology, Massachusetts General Hospital, Boston, MA