RT Article T1 Estimating the population size of men who have sex with men in the United States to obtain HIV and syphilis rates JF The open AIDS journal VO 6 SP 98 OP 107 A1 Purcell, David W. A2 Crepaz, Nicole A2 Su, John J. A2 Weinstock, Hillard A2 Gau, Zaneta A2 Denning, Paul A2 Stein, Renee A2 Prejean, Joseph A2 Lansky, Amy L. 1955- A2 Johnson, Christopher H. LA English YR 2012 UL https://krimdok.uni-tuebingen.de/Record/1912540983 DO 10.2174/1874613601206010098