Institute for Medical Research;
Department for Immunohistochemistry and Electron Microscopy;
Belgrade;
Serbia and Montenegro;
Clinic for Gastroenterology and Hepatology;
Institute for Digestive Diseases;
Clinical Center of Serbia;
Belgrade;
Serbia and Montenegro;
Pathology Department;
Institute for Digestive Diseases;
Clinical Center of Serbia;
Belgrade;
Serbia and Montenegro;
Institute of Histology and Embryology;
Faculty of Medicine;
University of Nis;
Serbia and Montenegro;
Clinic for Gastroenterology;
Hepatology and Infectious Diseases;
Otto-von-Guericke University;
Magdeburg;
Germany;