[1] Institute of Infectious Pathology and Virology,
[2] G. Di Cristina Hospital,undefined
[3] University of Palermo,undefined
[4] Piazza Montalto n. 8,undefined
[5] 90134 Palermo,undefined
[6] Italy e-mail cascioa@unipa.it,undefined
[7] Department of Oral Medicine,undefined
[8] Dental School,undefined
[9] University of Palermo,undefined
[10] Via del Vespro 129,undefined
[11] 90100 Palermo,undefined
[12] Italy,undefined
[13] Regional Centre for AIDS and HIV-related Syndromes Diagnosis,undefined
[14] University of Palermo,undefined
[15] Via del Vespro 129,undefined
[16] 90100 Palermo,undefined
[17] Italy,undefined