Correction to: Establishing a core outcome set for mucopolysaccharidoses (MPS) in children: study protocol for a rapid literature review, candidate outcomes survey, and Delphi surveys - Howie, Alison H.; Tingley, Kylie; Inbar-Feigenberg, Michal; Mitchell, John J.; Butcher, Nancy J.; Offringa, Martin; Smith, Maureen; Angel, Kim; Gentle, Jenifer; Wyatt, Alexandra; Campeau, Philippe M.; Chan, Alicia; et al. (Université d'Ottawa | University of Ottawa, 2021)