[1] Univ N Carolina, Dept Social Med, 333 South Columbia St,MacNider Hall, Chapel Hill, NC 27599 USA
[2] Miriam Hosp, Ctr Prisoner Hlth & Human Rights, Providence, RI 02906 USA
[3] Univ New South Wales, Natl Drug & Alcohol Res Ctr, Sydney, NSW, Australia
[4] Univ Arkansas Med Sci, Coll Publ Hlth, Little Rock, AR 72205 USA
[5] Univ Calif San Francisco, Dept Psychiat, San Francisco, CA USA
[6] Miriam Hosp, Div Infect Dis, Providence, RI 02906 USA