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Factor structure and convergent validity of the Derriford Appearance Scale-24 using standard scoring versus treating 'not applicable' responses as missing data: a Scleroderma Patient-centered Intervention Network (SPIN) cohort study.
Merz EL, Kwakkenbos L, Carrier ME, Gholizadeh S, Mills SD, Fox RS, Jewett LR, Williamson H, Harcourt D, Assassi S, Furst DE, Gottesman K, Mayes MD, Moss TP, Thombs BD, Malcarne VL; SPIN Investigators. Merz EL, et al. BMJ Open. 2018 Mar 6;8(3):e018641. doi: 10.1136/bmjopen-2017-018641. BMJ Open. 2018. PMID: 29511009 Free PMC article.