Funding for this research was provided by:
National Natural Science Foundation of China (21675056)
the Scientific and Technological Planning Project of Guangzhou City (201805010002)
Text and Data Mining valid from 2019-02-08
Received: 1 November 2018
Revised: 11 January 2019
Accepted: 24 January 2019
First Online: 8 February 2019
Compliance with ethical standards
: We obtained the informed consent of all individual participants whom urine samples were obtained from. The studies were approved by the Scientific Research Ethics Committee of South China Normal University and were performed in accordance with the ethical standards.
: The authors declare that they have no competing interests.