Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) C. Beard and K.J. Hsu and L.S. Rifkin and A.B. Busch and T. Björgvinsson,Validation of the PHQ-9 in a psychiatric sample,Journal of Affective Disorders,0165-0327,Elsevier BV,2016-03,193,,267-273,https://cir.nii.ac.jp/crid/1360574093913180288,https://doi.org/10.1016/j.jad.2015.12.075