Shortening self-report mental health symptom measures through optimal test assembly methods: Development and validation of the Patient Health Questionnaire-Depression-4.
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Ishihara M, et al. Among authors: sidebottom a.
Depress Anxiety. 2019 Jan;36(1):82-92. doi: 10.1002/da.22841. Epub 2018 Sep 20.
Depress Anxiety. 2019.
PMID: 30238571
Free PMC article.