Affiliation: | aReal Time Systems and Image Analysis Group, Department of Informatics and Telecommunications, University of Athens, Panepistimiopolis, Illisia, 15784 Athens, Greece bDepartment of Informatics and Computer Technology, Technological Educational Institute of Lamia, Lamia 35100, Greece cGastroenterology Section, Department of Pathophysiology, Medical School, University of Athens, Laiko General Hospital, 17 St. Thomas Str., 115 27, Athens, Greece |