Summed score of the Patient Health Questionnaire-9 was a reliable and valid method for depression screening in chronically ill elderly patients.
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J. Knottnerus | B. Penninx | H. Bosma | F. Lamers | J. V. van Eijk | J. T. V. van Eijk | C. Jonkers | J. Knottnerus | B. Penninx