author: Spyropoulos, Vasileios_or_Toumpis, Stavros_or_Παπανικολάου, Γεώργιος__eltype: 7collection: 2subjectTerm: II. NATURAL SCIENCES AND AGRICULTURAL SCIENCES_or_IV. MEDICINE AND HEALTH SCIENCES, LIFE SCIENCES, BIOLOGICAL SCIENCES_or_I. MATHEMATICS AND COMPUTER SCIENCE