Received: 6 March 2020
Accepted: 5 August 2020
First Online: 10 August 2020
Ethics approval and consent to participate
: The authors declare that all individual participants from whom the urine samples were obtained gave informed consent, and the studies have been approved by the Hunan University of Technology Ethics Committee and have been performed in accordance with ethical standards.
: Written informed consent for publication was obtained from all participants.
: The authors declare that they have no competing interests.