Article History
Received: 18 June 2018
Accepted: 21 September 2018
First Online: 5 October 2018
Compliance with ethical standards
:
: The authors report no conflict of interest.
: The study was approved by the Health Sciences Institutional Review Board of Huashan Hospital. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Written consent was obtained from all participants.