Received: 21 December 2017
Accepted: 25 January 2019
First Online: 8 February 2019
Ethics approval and consent to participate
: We confirm that all aspects of the work covered in this manuscript that has involved human patients have been conducted with the ethical approval of all relevant bodies and that such approvals are acknowledged within the manuscript. Verbal consent was obtained from the patients who responded. This retrospective study was approved by the institutional review board of West China Hospital of Sichuan University, and it has been retrospectively registered at ExternalRef removed (ChiCTR1800019024).
: Written informed consent for publication was obtained from the patient described in the study.
: The authors declare that they have no competing interests.
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