RT Article T1 Two-year trajectories of sexual risk behaviors among drug-using adolescents and emerging adults in an urban community JF Aids and behavior VO 21 IS 7 SP 2069 OP 2078 A1 Bonar, Erin E. A1 Cunningham, Rebecca M. A1 Blow, Frederic C. A1 Zimmerman, Marc A. A1 Epstein-Ngo, Quyen M. A1 Walton, Maureen A. A2 Cunningham, Rebecca M. A2 Blow, Frederic C. A2 Zimmerman, Marc A. A2 Epstein-Ngo, Quyen M. A2 Walton, Maureen A. LA English YR 2017 UL https://krimdok.uni-tuebingen.de/Record/1912731584 DO 10.1007/s10461-016-1570-z