Funding for this research was provided by:
Special Funds of the State Environmental Protection Public Welfare Industry (201309049)
National Key Research and Development Program (2018YFC0213704)
Received: 19 December 2019
Accepted: 23 August 2020
First Online: 5 September 2020
Ethics approval and consent to participate
: Questionnaires were administered on the status that informed consents were signed. This study was approved by the Ethics Committee of the School of Science, Beijing Jiaotong University and the No. 1 People’s Hospital of Xiaogan. After informed consents were obtained from subjects, this survey was carried out by uniformly trained investigators.
: Not applicable.
: The authors declare that they have no competing interests.