datepublished: 2015author: Kroupis, Christos_or_Spyropoulos, Vasileios_or_Giannakouris, Nikolaos_or_Michelaki, Paraskevi__entype: 1subjectTerm: II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES_or_I. MATHEMATICS AND COMPUTER SCIENCE_or_IV. MEDICINE AND HEALTH SCIENCES, LIFE SCIENCES, BIOLOGICAL SCIENCES