TY - JOUR A1 - Zablotska, I.B. A1 - Imrie, J. A1 - Prestage, G. A1 - Crawford, J. A1 - Rawstorne, P. A1 - Grulich, A. A1 - Jin, F. A1 - Kippax, S. T1 - Gay men’s current practice of HIV seroconcordant unprotected anal intercourse: Serosorting or seroguessing? Y1 - 2009 DO - 10.1080/09540120802270292 VL - 21 IS - 4 ER -