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Authors
Zhang, Yongyang
Zhang, Ying
Li, Xuling
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Article History
Received: 29 April 2019
Accepted: 1 August 2019
First Online: 29 August 2019
Compliance with ethical standards
:
: The authors declare that they have no competing interests.
: The study was approved by Ethics Committee of Jining No. 1 People’s Hospital, with written informed consents offered by all participants or their relatives.
