Jahanfar, Shayesteh http://orcid.org/0000-0001-6149-1067
Walters, Hannah
Article History
Received: 30 May 2018
Accepted: 2 February 2019
First Online: 11 February 2019
Compliance with ethical standards
:
: The auths declare that they have no competing interests.
: All procedures perfmed in studies involving human participants were in accdance with the ethical standards of the institutional and/national research committee and with the 1964 Helsinki Declaration and its later amendmentscomparable ethical standards. No procedure perfmed on humans. This article does not contain any studies with animals perfmed by any of the authors.
: Informed consent if the research involved Human participants: We used secondary data that collected by Washington State University Twin Registry. The consent form was filled by each participants at the time of participation.