DOI:
10.1055/s-00000060
PPmP - Psychotherapie · Psychosomatik · Medizinische Psychologie
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References
Kroenke K, Spitzer RL, Williams JB. et al.
An ultra-brief screening scale for anxiety and depression: the PHQ-4.
Psychosomatics 2009;
50: 613-621
DOI: 10.1176/appi.psy.50.6.613.
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