S. R. Montalbán, A. Comas Vives, and M. Garcia-Garcia, “Validation of the Spanish Version of the PHQ-15 Questionnaire for the evaluation of physical symptoms in patients with depression and/or anxiety disorders: DEPRE-SOMA study”, Actas Esp Psiquiatr, vol. 38, no. 6, pp. 345–357, Nov. 2010.