Funding for this research was provided by:
Hubei Provincial Education Department of Pilot Reformation (201628)
Received: 9 August 2017
Accepted: 26 February 2018
First Online: 12 March 2018
Ethics approval and consent to participate
: Ethical approval was sought from the Research Ethical Committee of the study hospital and Hubei University of Medicine in China prior to commencement of the study. Consent was obtained from the participants upon recruitment. Participation was voluntary for this study, and the participants were free to quit at any point of time without penalty.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.