Funding for this research was provided by:
National Institute on Drug Abuse (DA07484)
Article History
Received: 6 March 2017
Revised: 27 July 2017
Accepted: 3 August 2017
First Online: 24 August 2017
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all parents included in the study. Participants signed assent.
: All procedures were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.