From the ^aDepartment of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC

^bInjury Prevention Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC

^cDivision of Infectious Diseases, University of North Carolina School of Medicine, Chapel Hill, NC

^dCollege of Allied Health Professions, University of Nebraska Medical Center, Omaha, NE

^eUniversity of North Carolina Gillings School of Global Public Health, Chapel Hill, NC.

This work was supported by the National Institute On Drug Abuse of the National Institutes of Health under Award Numbers F31DA055345 (Figgatt) and K23DA049946 (Schranz). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.

The authors report no conflicts of interest.

Correspondence: Mary C. Figgatt, 135 Dauer Drive, Chapel Hill, NC 27599. E-mail: [email protected].