Correction to: Association between plasma interleukin-33 level and acute exacerbation of chronic obstructive pulmonary disease (BMC Pulmonary Medicine, (2021), 21, 1, (86), 10.1186/s12890-021-01423-8)

Following publication of the article [1], it came to the authors’ attention that incorrect R values had been provided for Fig. 4a, b. The figure has been updated in the published article and the correct values may be found in this correction article. The authors thank you for reading and apologize for any inconvenience caused. (Figure presented.).