Received: 24 January 2019
Accepted: 26 March 2019
First Online: 30 April 2019
Ethics approval and consent to participate
: The study was approved by the ethics committees of The Second Hospital of Tianjin Medical University and LU’AN Affiliated Hospital of Anhui Medical University. Informed consent was obtained from all individual participants included in the study.
: Not applicable.
: The authors declare that they have competing interests.
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