Received: 15 November 2017
Accepted: 7 February 2018
First Online: 5 March 2018
Ethics approval and consent to participate
: Permission for this study was obtained from the ethics committee of Wuhan University with the reference number of 201609272015203070006. Participants were informed with specific information about this study and chose to sign the informed consent form voluntarily. They had the right to withdraw from the study at any time without penalty or loss of benefits. To protect the confidentiality, each participant was given a code number to replace their names, and the evaluation form was completed anonymously. The signed consent forms were stored separately from the collected data to avoid identification.
: Not applicable.
: The authors declare that they have no competing interests.