Funding for this research was provided by:
Postdoctoral Research Foundation of China (2017M622876)
Development and Reform Commission of Shenzhen Municipality (s2016005470013)
Shenzhen Science and Technology Innovation Committee (JCYJ20170306091452714, JCYJ20170413162242627, GJHZ20170313172439851)
Text and Data Mining valid from 2019-02-09
Received: 7 November 2018
Accepted: 4 February 2019
First Online: 9 February 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of Shenzhen Second People’s Hospital.
: All authors have approved the final manuscript for publication.
: The authors declare that they have no competing interests.
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