Karjalainen, Piia https://orcid.org/0000-0001-7339-888X
Santalahti, Päivi https://orcid.org/0000-0002-7223-4071
Aronen, Eeva T. https://orcid.org/0000-0001-8756-8894
Kiviruusu, Olli https://orcid.org/0000-0003-4864-8378
Funding for this research was provided by:
Helsinki University Hospital Research Funds
Alli Paasikivi Foundation
Jalmari and Rauha Ahokas Foundation
Yrjö Jahnsson Foundation
MLL Research Fund
Emil Aaltonen Foundation
Marjaniemi Lions Club Ladies
Article History
Received: 20 October 2020
Accepted: 11 January 2021
First Online: 11 February 2021
Ethics approval and consent to participate
: The study was approved by the Intermunicipal Hospital District of Helsinki-Uusimaa Ethics Committee in February 2016, and the trial is registered in the ClinicalTrials.gov registry (NCT03239990). Participants have been asked to give written consent to participate in the study.
: All authors have agreed with the content and all have given explicit consent to submit this article.
: Authors Olli Kiviruusu, Eeva Aronen and Päivi Santalahti have no conflicts to be declared. Author Piia Karjalainen has gotten paid in training occasionally daycare and school personnel in Incredible Years Teacher Classroom Management Program.