Correction: Effects of Chinese medicine for COVID-19 rehabilitation: a multicenter observational study - Linda Li-Dan Zhong; Yi-Ping Wong; Chor-Yin Leung; Bo Peng; Zhi-Xiu Lin; Vivian Chi-Woon Wong Taam; Yi Luo; Hai-Yong Chen; Chao-Dong Chao; Chor-Fung Wong; Freddie Shung-Chi Tam; Kui Chan; et al. (BMC, 2022)