Timmerby, N, Andersen, J H, Søndergaard, S, Østergaard, S D & Bech, P 2017, ' A Systematic Review of the Clinimetric Properties of the 6-Item Version of the Hamilton Depression Rating Scale (HAM-D6) ', Psychotherapy and Psychosomatics, vol. 86, no. 3, pp. 141-149 . https://doi.org/10.1159/000457131