Wang, Qiang
Sun, Chang-Tai
Article History
Received: 26 May 2018
Accepted: 15 April 2019
First Online: 9 May 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board of Ethics Committee of Beijing Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The informed consent was orally obtained from patients, but not by a form. Additionally, all the patients’ data were anonymously tagged for analyses.
: Not applicable
: The authors declare that they have no competing interests.
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