Wang, Li-Min
Zhong, You
Ming-Hua, Su
Meng-Jun, Wu
Article History
Received: 18 November 2019
Accepted: 20 January 2020
First Online: 13 February 2020
Ethics approval and consent to participate
: Our paper is just a letter.
: All authors agree to the contents of the submitted manuscript and acknowledge familiarity with the journal’s instructions for manuscript submission.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.