Johannson, Annika http://orcid.org/0000-0001-7609-0258
Vorobjov, Sigrid
Heimer, Robert
Dovidio, John F.
Uusküla, Anneli
Funding for this research was provided by:
National Institutes of Health (R01 DA029888)
Estonian Ministry of Education and Research (IUT34-17)
Article History
First Online: 19 December 2016
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the human research ethics boards at the University of Tartu in Estonia and Yale University in the United States. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committees and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.