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Article History

Received: 16 January 2018

Accepted: 4 April 2018

First Online: 24 April 2018

Ethics approval and consent to participate

: The study protocol was approved by the Ethics Committee of Weifang People’s Hospital, and both the clinicians and patients provided signed informed consent.

: Patients provided consent for the publication of data about their health and health-related outcomes.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.