Funding for this research was provided by:
outstanding scientific fund of shengjing hospital (M731)
Article History
Received: 15 November 2016
Accepted: 28 January 2017
First Online: 6 February 2017
Compliance with ethical standards
: This study was funded by the Outstanding Scientific Fund of Shengjing Hospital (grant number M731).
: The authors have no potential conflicts of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.