Funding for this research was provided by:
National Key R & D Program of China (2016YFC20160905200)
National Natural Science Foundation of China (81570895, 81420108009, 81400444, 81470678, 81630023)
Changjiang scholars and innovative research team (IRT13082)
special fund of capital health development (2011-1017-06, 2011-1017-02)
special fund of sanitation elite reconstruction of Beijing (2009-2-007)
Beijing health bureau program for high level talents (2011-3-043)
Beijing Municipal Administration of Hospitals’ Mission Plan (SML20150203)
Capital citizenry health program (z161100000116062)
Article History
Received: 11 May 2018
Accepted: 11 September 2018
First Online: 21 November 2018