Funding for this research was provided by:
National Institutes of Health (R01-HD055741, P30-HD003110, T32-HD040127)
Simons Foundation (140209)
Text and Data Mining valid from 2020-02-05
Received: 30 October 2019
Accepted: 21 January 2020
First Online: 5 February 2020
Ethics approval and consent to participate
: Procedures for this study were approved by the Institutional Review Boards at each clinical data collection site: University of North Carolina at Chapel Hill, University of Washington in Seattle, Children’s Hospital of Philadelphia, and Washington University in St. Louis.
: Not applicable.
: The authors declare that they have no competing interests.