The authors regret that this article was published with two references missing from the reference list.
In Table 1, the citation that currently reads Williams et al. 2014 is incorrect. This should have referred to: Stanojevic S, Kaminsky DA, Miller M, et al. ERS/ATS technical standard on interpretive strategies for routine lung function tests. Eur Respir J. 2022 Jul 13;60(1):2101499.
In Table 2, the three citations within the table that currently read Zakrisson et al. 2011 should instead have referred to: Borg G. Psychophysical bases of perceived exertion. Med Sci Sports Exerc. 1982;14(5):377-381.