Zafeiridi E, McMichael AJ, Passmore AP, McGuinness B. Living alone for people on dementia medication: related use of drugs. Aging (Albany NY). 2020 Oct 21;12(20):20924-9. doi: 10.18632/aging
Luciano JV, Barrada JR, Aguado J, Osma J, García-Campayo J. Bifactor analysis and construct validity of the HADS: a cross-sectional and longitudinal study in fibromyalgia patients. Psychological Assessment. 2014 Jun;26(2):395-406.