1 Tours university, 37000 Tours, France; Department of hepatogastroenterology and digestive oncology, university hospital, 37044 Tours cedex 9, France. Electronic address: thierry.lecomte@med.univ-tours.fr.
2 Department of hepatogastroenterology and digestive oncology, university hospital, 37044 Tours cedex 9, France.
3 Department of pathology, university hospital, 37044 Tours cedex 9, France.