An Ultra-Brief Screening Scale for Anxiety and Depression: The PHQ-4

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Kurt Kroenke, Robert L. Spitzer, Janet B. W. Williams, Bernd Löwe (2009). An Ultra-Brief Screening Scale for Anxiety and Depression: The PHQ-4. Psychosomatics. https://doi.org/10.1016/s0033-3182(09)70864-3

@article{kurt2009an,
  title  = {An Ultra-Brief Screening Scale for Anxiety and Depression: The PHQ-4},
  author = {Kroenke, Kurt and Spitzer, Robert L. and Williams, Janet B. W. and Löwe, Bernd},
  year   = {2009},
  journal = {Psychosomatics},
  doi    = {10.1016/s0033-3182(09)70864-3}
}

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