Article History
Received: 17 July 2018
Accepted: 9 November 2018
First Online: 15 November 2018
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: This research was approved by the Ethical Committee Review Board of the Second Hospital of Tianjin Medical University, Tianjin, China, and has been performed according to the ethical standards of <i>Declaration of Helsinki</i>.
: All the participants provided written informed consents.