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. 2019 May 14;20:89. doi: 10.1186/s12931-019-1053-7

Fig. 2.

Fig. 2

The distribution of physical activity level through GOLD classes by 2013 and 2017 editions. a GOLD 2013 by mMRC. b GOLD 2013 by CAT. c GOLD 2017 by mMRC. d GOLD 2017 by CAT