@article{a7e214fe4276485db278c8801b739c2e,
title = "Summed score of the Patient Health Questionnaire-9 was a reliable and valid method for depression screening in chronically ill elderly patients",
author = "L.M. Lamers and C.C.M. Jonkers and H. Bosma and B.W.J.H. Penninx and J.A. Knottnerus and \{van Eijk\}, J.T.",
year = "2008",
doi = "10.1016/j.jclinepi.2007.07.018",
language = "English",
volume = "61",
pages = "679--687",
journal = "Journal of Clinical Epidemiology",
issn = "0895-4356",
publisher = "Elsevier Inc.",
number = "7",
}