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subscription/membership/fee required Elsevier Science https://linkinghub.elsevier.com/retrieve/pii/S0163-8343(11)00367-7
Anxiety free resource MedlinePlus Health Information https://medlineplus.gov/anxiety.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22245165/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/22245165
subscription/membership/fee required ClinicalKey https://www.clinicalkey.com/content/playBy/pii?v=S0163-8343(11)00367-7
Anxiety free resource MedlinePlus Consumer Health Information https://medlineplus.gov/anxiety.html