The Four-Dimensional Symptom Questionnaire (4DSQ): a validation study of a multidimensional self-report questionnaire to assess distress, depression, anxiety and somatization

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Berend Terluin^*, Harm WJ van Marwijk, Herman J Adèr, Henrica CW de Vet, Brenda WJH Penninx, Marleen LM Hermens, Christine A van Boeijen, Anton JLM van Balkom, Jac JL van der Klink and Wim AB Stalman