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Merz EL, Kwakkenbos L, Carrier M on behalf of the SPIN Investigators, et al. 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. BMJ Open 2018;8:e018641. doi:10.1136/bmjopen-2017-018641
In the Collaborator list, the name ‘Ilham Benzida’ should have been spelt ‘Ilham Benzidia’.