Younes SA, Trautmann L, Yassine-Diab B, Kalfayan LH, Kernaleguen AE, Cameron TO, Boulassel R, Stern LJ, Routy JP, Grossman Z, Dumont AR, Sekaly RP. The duration of exposure to HIV modulates the breadth and the magnitude of HIV-specific memory CD4+ T cells. J Immunol. 2007 Jan 15; 178(2):788-97.