1. Department of Diagnostic Radiology, Clinique St. Luc, Bouge, Namur 5004, Belgium.
2. Department of Internal Medicine, Clinique St. Luc, Bouge, Namur 5004, Belgium.
3. Institute of Pathology and Genetics, Gosselies 6-6041, Belgium.
4. Department of Visceral Surgery, Clinique St. Luc, Bouge, Namur 5004, Belgium.