Funding for this research was provided by:
Natural Science Foundation of Tianjin City (17JCZDJC35300,15JCZDJC35400 and JCYBJC27200)
Tianjin Municipal Natural Science Foundation (grant 17JCYBJC26000)
Received: 20 June 2018
Accepted: 17 June 2019
First Online: 25 June 2019
Ethics approval and consent to participate
: This study was approved by an independent ethical committee/institutional review board of the Second Hospital of Tianjin Medical University, Tianjin, China. Written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.