Funding for this research was provided by:
National Institutes of Health (U54NS092090)
Child Neurology Foundation
Phelan-McDermid Syndrome Foundation
William Randolph Hearst Foundation
Received: 22 June 2020
Accepted: 28 December 2020
First Online: 28 April 2021
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board (IRB-P00021244 and IRB-P00013300) at Boston Children’s Hospital, which serves as the central IRB for all the sites included in this study. Informed consent was obtained from the legal guardians of all participants and assent was obtained from participants when appropriate.
: Not applicable.
: The authors declare that they have no competing interests.