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Article History

Accepted: 1 November 2020

First Online: 6 January 2021

Compliance with Ethical Standards

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: The authors declare that they have no competing interests. The second author was involved in the implementation of MST in Norway, as a part of the national implementation team at the Norwegian Center for Child Behavioral Development (NUBU). Because of this, he was not involved in any data analyses, but in the interpretation of the findings.

: The data material used in this study was collected for quality assurance purposes, and anonymized after data collection was concluded. For data collected before July 20, 2018, the processing was approved by the Norwegian Data Protection Authority. After the European Union´s General Data Protection Regulation (GDPR) came into force, the processing was based on informed consent. This study was submitted to the Norwegian Regional Committee for Medical and Health Research Ethics (REC). REC found that the project was considered quality assurance under Norwegian law and thus not covered by Norwegian law on research ethics and medical research.