TY - JOUR A1 - Parsons, J.T. A1 - Schrimshaw, E.W. A1 - Wolitski, R.J. A1 - Halkitis, P.N. A1 - Purcell, D.W. A1 - Hoff, C.C. A1 - Gomez, C.A. T1 - Sexual harm reduction practices of HIV-seropositive gay and bisexual men: serosorting, strategic positioning, and withdrawal before ejaculation Y1 - 2005 DO - 10.1097/01.aids.0000167348.15750.9a JF - AIDS VL - 19 IS - Supplement 1 ER -