Article History
Received: 19 November 2018
Revised: 7 May 2019
Accepted: 29 May 2019
First Online: 8 July 2019
Compliance with ethical standards
:
: The scientific guarantor of this publication is Lan Chu.
: The authors of this manuscript declare no relationships with any companies, whose products or services may be related to the subject matter of the article.
: One of the authors has significant statistical expertise.
: Written informed consent was obtained from all subjects (patients) in this study.
: Institutional Review Board approval was obtained.
: • prospective• diagnostic or prognostic study• performed at one institution