Psychometric evaluation of modified spinal muscular atrophy functional rating scale (SMAFRS) in adult patients using Rasch analysis. - Sadjadi R; Kelly K; Glanzman AM; Montes J; Linsenmayer M; Tellez M; Bartlett A; Heintzman S; Kolb SJ; Arnold WD; El-Sheikh B (Muscle & nerve, 2023)