[1] Medical School,Department of Hygiene, Epidemiology and Medical Statistics
[2] National and Kapodistrian University of Athens,Department of Hygiene, Epidemiology and Medical Statistics
[3] Hellenic Scientific Society for the Study of AIDS and Sexually Transmitted Diseases,undefined
[4] Hologic Inc.,undefined
[5] National Retrovirus Reference Center,undefined
[6] National and Kapodistrian University of Athens Medical School,undefined