Fig. 2.
Mobility impairment in the International Morquio A registry (including 326 patients with MPS IVA) [14], the Morquio A Clinical Assessment Program (MorCAP) (including 325 patients with MPS IVA) [11], the MPS VI Survey (including 121 patients with MPS VI) [13] and the Dutch MPS Survey (including 55 patients with MPS I, II, III, IV, and VI) [15]