Received: 19 February 2020
Accepted: 13 May 2020
First Online: 20 May 2020
Ethics approval and consent to participate
: The study was approved by the institutional review board of Affiliated Hospital 2 of Nantong University and First People’s Hospital of Nantong City, and written informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.