Funding for this research was provided by:
Guangdong Science and Technology Grant (2014A020212037)
Shenzhen Science and Technology Grant (SZXJ2017008, JCYJ20160428175005906)
Received: 1 May 2018
Accepted: 7 May 2019
First Online: 22 May 2019
Ethics approval and consent to participate
: The verbal informed consents were obtained from all individual participants included in the study. The study and the informed consents procedure were approved by Peking University Shenzhen Hospital Medical Ethics Committee (2017).
: Not applicable.
: The authors declare that they have no competing interests.
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