Funding for this research was provided by:
National Institute on Drug Abuse (R01DA037117)
Received: 6 June 2017
Accepted: 2 October 2017
First Online: 18 October 2017
Ethics approval and consent to participate
: The study received IRB approval through the University of Nebraska-Lincoln (IRB# 20131113844FB) and the University Of Puerto Rico School Of Medicine (IRB# A8480115).
: Co-author Dr. Kirk Dombrowski is PI for data collection and consents to publication. We will gladly provide any necessary forms upon request.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.