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
Erin L Merz, Linda Kwakkenbos, Marie-Eve Carrier, Shadi Gholizadeh, Sarah D Mills, Rina S Fox, Lisa R Jewett, Heidi Williamson, Diana Harcourt, Shervin Assassi, Daniel E Furst, Karen Gottesman, Maureen D Mayes, Tim P Moss, Brett D Thombs, Vanessa L Malcarne
BMJ Open Mar 2018, 8 (3) e018641; DOI: 10.1136/bmjopen-2017-018641