Funding for this research was provided by:
the National Natural Science Foundation of China (No. 81470485)
Beijing Municipal Natural Science Foundation (No. 7152123)
Capital Clinical Featured Application Research Project (NO. z151100004015175)
National Science and Technology Support Project (2012CB517501)
the National Key Technology R&D Program (2015BAI12B00)
CAMS Innovation Fund for Medical Sciences (NO. 2016I2M1009)
Received: 10 October 2017
Accepted: 27 June 2018
First Online: 16 July 2018
Ethics approval and consent to participate
: The study was conducted according to the guidelines of Helsinki Declaration and was approved by the Ethics Committee of Kailuan General Hospital and Beijing Tiantan Hospital. Written informed consents were obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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