Funding for this research was provided by:
Guangdong Science and Technology Department (2018A030310646)
Urban Management Bureau of Shenzhen Municipality (No. SZBC2017022)
China's Post-doctoral Science Fund (2018M643303)
Received: 21 July 2018
Accepted: 28 March 2019
First Online: 16 April 2019
Ethics approval and consent to participate
: This study was approved by the medical ethics review board of Shenzhen Second People’s Hospital. Written informed consent was obtained from all patients.
: The authors declare that they have no competing interests.
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