Cui, Li http://orcid.org/0000-0001-6161-6958
Kong, Lu http://orcid.org/0000-0003-2299-6438
Bai, Yan-Hua http://orcid.org/0000-0002-7331-7194
Li, Xiao-Hui http://orcid.org/0000-0002-1172-5707
Wang, Xiu-Qi http://orcid.org/0000-0001-9644-0454
Hao, Jing-jing http://orcid.org/0000-0001-5361-9534
Duan, Feng http://orcid.org/0000-0001-8432-590X
Article History
First Online: 24 February 2020
Compliance with ethical standards
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: The authors declare that they have no competing interests.