Differential Item Functioning on the Patient Health Questionnaire-8 by Disease Subtype, Language, Sex, and Age among People with Systemic Sclerosis: A Scleroderma Patient-centered Intervention Network Cohort Study.

Sophie Hu, Marie-Eve Carrier, Marie-Claude Geoffroy, Meira Golberg, Linda Kwakkenbos, Susan J Bartlett, Catherine Fortuné, Amy Gietzen, Karen Gottesman, Geneviève Guillot, Laura K Hummers, Amanda Lawrie-Jones, Vanessa L Malcarne, Michelle Richard, Maureen Sauvé