Correction to: Orphanet Journal of Rare Diseases (2021) 16:208 https://doi.org/10.1186/s13023-021-01782-9

Following the publication of the original article [1] it was brought to our attention that the joint first authorship and equal contribution of Shengcai Wang, Wei Wang and Xuexi Zhang, was not indicated in the published article.

The joint first authorship and equal contribution of the three co-authors has now been marked with dagger symbols in the author list and an explanatory footnote at the end of this Correction.

The original article has also been corrected as above.