The supplementary material for this article can be found at https://doi.org/10.1017/S0033291719001776 .

This work was funded by the Netherlands Organization for Scientific Research (NWO Brain & Cognition 433-09-228) and supported by strategic funding from The University of Queensland and from the Children's Hospital Foundation. The analyses were carried out on the Genetic Cluster Computer, which is financed by the Netherlands Scientific Organization (NWO; 480-05-003), by Vrije Universiteit Amsterdam and by the Dutch Brain Foundation and is hosted by the Dutch National Computing and Networking Services (SurfSARA). This research has been conducted using summary statistics data available via the website of the Psychiatric Genomics Consortium. We thank the participants and researchers who contributed and collected the data.

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