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Attention Deficit Hyperactivity Disorder free resource MedlinePlus Health Information https://medlineplus.gov/attentiondeficithyperactivitydisorder.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/32691164/
subscription/membership/fee required Springer https://dx.doi.org/10.1007/s00787-020-01586-5
free resource Europe PubMed Central https://europepmc.org/abstract/MED/32691164