Article History
Received: 13 April 2017
Accepted: 30 June 2017
First Online: 12 July 2017
Change Date: 26 September 2019
Change Type: Correction
Change Date: 26 September 2019
Change Type: Correction
Change Details: In paragraph Index calculation formulae
Change Details: In paragraph Index calculation formulae
Compliance with ethical standards
:
: Linman Li, Wenyi You, and Wei Ren declare that they have no conflict of interest.
: All procedures involving human participants were performed in accordance with the ethical standards of the First Affiliated Hospital of Chongqing Medical University and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.