The abstracts must be carefully written following these instructions: - The text body should be less than 2000 letters including spaces; - Greek characters should be avoided (use: alpha, beta etc.); - The title must be written in capital letters; - Three keywords should be pointed out. - The name of the Presenting Author should be markd with an asterisk (*) and complete affiliation details should be provided (address, telephone number, fax, e-mail); - only the affiliation should be provided for co-authors.