[1] San Francisco Dept Publ Hlth, 25 Van Ness Ave,Suite 500, San Francisco, CA 94102 USA
[2] Boston Univ, Grayken Ctr Addict, Sch Med, Clin Addict Res & Educ Unit, Boston, MA USA
[3] Boston Univ, Boston Med Ctr, Boston, MA USA
[4] Brandeis Univ, Heller Sch Social Policy & Management, Waltham, MA USA
[5] Rhode Isl Hosp, Ctr Biomed Res Excellence Opioids & Overdose, Providence, RI USA
[6] Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA