Funding for this research was provided by:
National Institute of Mental Health (R01 MH101504, R37 MH050560, P50 MH100031)
Article History
Accepted: 20 October 2020
First Online: 9 January 2021
Compliance with Ethical Standards
:
: The authors have no competing or potential conflicts of interest.
: Informed assent was obtained from all twins included in the study, and informed consent was obtained from participants’ caregivers. The Institutional Review Board at the University of Wisconsin—Madison approved the protocol. All procedures performed in studies involving human participants 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.