Potential conflict of interest
Disclosure forms provided by the authors are available with the full text of this article at http://dx.doi.org/10.3109/10428194.2016.1160087.
Funding information
This work was supported by grants from the National Natural Science Foundation of China [81270609, 30770909 and 81470008], the Major Science & Technology Project of Fujian Province [2003F003, 2012Y4012], the Major Science & Technology Project of Fujian Medical University [09ZD008] and the National and Fujian Provincial Key Clinical Specialty Discipline Construction Program, PR China.