Funding for this research was provided by:
Japan Society for the Promotion of Science (18651028)
Japan Science and Technology Corporation (OSAKA H23-1)
New Energy and Industrial Technology Development Organization (05A21501a)
Received: 19 March 2020
Accepted: 16 May 2020
First Online: 27 May 2020
Ethics approval and consent to participate
: Human urine was supplied by voluntary students with informed consent, and the use of urine in the present study was approved by the Research Ethics Committee of Osaka Prefecture University.
: Not applicable.
: The authors declare that they have no competing interests.