[1] Technol Educ Inst Crete, Dept Business Adm, Iraklion 72100, Greece
[2] Technol Educ Inst Crete, Dept Informat Engn, Iraklion 71500, Greece
[3] Univ Nicosia, Dept Comp Sci, CY-1700 Nicosia, Cyprus
[4] Nanjing Agr Univ, Sch Engn, Nanjing 210014, Jiangsu, Peoples R China
[5] Univ Lincoln, Sch Engn, Lincoln LN6 7TS, England
[6] Natl Inst Telecommun, BR-37540000 Santa Rita Do Sapucai, MG, Brazil
[7] Inst Telecomunicacoes, P-1049001 Lisbon, Portugal
[8] ITMO Univ, St Petersburg 197101, Russia
[9] Univ Fortaleza, BR-60811905 Fortaleza, Ceara, Brazil