Maritz, R., Tennant, A., Fellinghauer, C., Stucki, G. and Prodinger, B. (2019) “The Functional Independence Measure 18-item version can be reported as a unidimensional interval-scaled metric: Internal construct validity revisited”, Journal of Rehabilitation Medicine, 51(3), pp. 193–200. doi: 10.2340/16501977-2525.