Funding for this research was provided by:
Guangdong Science and Technology Planning Project (2014A020213013)
Received: 30 November 2019
Accepted: 7 February 2020
First Online: 2 March 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Guangdong Pharmaceutical University, and it was performed in accordance with the approved guidelines. Written informed consent were obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.