Funding for this research was provided by:
National Institute on Drug Abuse (R01DA037117)
Received: 28 April 2020
Accepted: 6 October 2020
First Online: 23 October 2020
Ethics approval and consent to participate
: Ethical approval for this study was granted by the Institutional Review Boards of the University of Nebraska-Lincoln and the Universidad de Puerto Rico, Recinto de Ciencias Medicas. All participants provided written consent after receiving study information and assurance of confidentiality.
: The authors declare that they have no competing interests.