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Authors
Chu, Haichen
Dong, He
Wang, Yongjie
Niu, Zejun
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Article History
Received: 12 November 2019
Accepted: 2 March 2020
First Online: 6 March 2020
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of the Affiliated Hospital of Qingdao University and registered with Chinese Clinical Trial Registry (ChiCTR1800016379). Written informed consent was obtained from all participants prior to inclusion in the study.
: Not applicable.
: The authors declare that they have no competing interests.
