Chambers GM, Botha W, Reilly N, Black E, Kingston D, Austin MP. The clinical performance and cost-effectiveness of two psychosocial assessment models in maternity care: the perinatal integrated psychosocial assessment study. Women Birth. 2021 Jun 4. doi: 10.1016/j.wombi.2021.05.007. doi: 10.1016/j.wombi.2021.05.007
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.