Funding for this research was provided by:
Substance Abuse and Mental Health Services Administration (HHSS283201000003C)
Text and Data Mining valid from 2018-06-29
Received: 13 June 2017
Accepted: 14 June 2018
First Online: 29 June 2018
Compliance with ethical standards
: After the study was described to participants, verbal informed consent was obtained.
: The study was approved by the RTI International Institutional Review Board in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
: The authors declare that they have no conflict of interest.