Funding for this research was provided by:
foundation of the National Natural Science Foundation of China (81560527)
Advanced Programs of Overseas Students Science and Technology Activities, Ministry of Human Resources and Social Security of the People's Republic of China ((08))
foundation of the National Natural Science Foundation of China (81760580)
Key Program of the Department of Science and Technology of Guizhou Province, China (2018-142)
Scientific and Technological Talent Support Program of the Educational Commission of Guizhou Province of China; Fund for Key Discipline Construction in Zunyi Medical University (2015)
Scientific and Technological Fund of Department of Health of Guizhou Province, China (gzwjkj2016-1-045)
Guizhou Science and Technology Department (gzwjkj2017-1-053)
Excellent Young Talents Fund Program of Higher Education Institutions of Anhui Province (5612)
Received: 25 July 2018
Accepted: 29 May 2019
First Online: 10 June 2019
Change Date: 5 August 2019
Change Type: Correction
Change Details: It has been highlighted that the original article  contained some errors in the Result section of the Abstract. The incorrect and correct statement is shown in the Correction article.
Ethics approval and consent to participate
: The proposal of the study was reviewed and approved by the Zunyi Medical University. The study was also approved by the Zunyi Medical University Ethics Committee, and oral consent was obtained from participants prior to the interview.
: Not applicable.
: The authors declare that they have no competing interest.