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Free full text from BORIS free resource Bern Open Repository and Information System https://boris.unibe.ch/id/eprint/148982
Child Mental Health free resource MedlinePlus Health Information https://medlineplus.gov/childmentalhealth.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31950371/
subscription/membership/fee required Springer https://dx.doi.org/10.1007/s00787-019-01467-6
free resource Europe PubMed Central https://europepmc.org/abstract/MED/31950371