Nadal N, de Batlle J, Barbe F, Marsal JR, Sanchez-de-la-Torre A, Tarraubella N, Lavega M, Sanchez-de-la-Torre M. Predictors of CPAP compliance in different clinical settings: primary care versus sleep unit. Sleep Breath. 2018 Mar;22(1):157-63. doi: 10.1007/s11325-017-1549-7
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.