Document is current

Article History

Received: 15 November 2017

Accepted: 27 February 2018

First Online: 20 March 2018

Ethics approval and consent to participate

: The Ethics Committee of the Ningbo No.2 Hospital approved this study. The analysis was performed in accordance with the ethical standards of the hospital and the tenets of the Declaration of Helsinki/Declaration of Istanbul. The patient reported in this study provided written consent.

: The consent for publication of the individual patient data from the patient has been obtained by Ningbo No.2 Hospital.

: The authors declare that they have no competing interests.

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