Article History
Received: 2 February 2019
Accepted: 26 June 2019
First Online: 5 July 2019
Ethics approval and consent to participate
: All subjects signed their informed consent for inclusion before they participated in the study. The study was conducted in accordance with the Declaration of Helsinki, and the protocol was approved by the Ethics Committee of the China Rehabilitation Research Center (Project identification code: 2018–053-1).
: Not applicable.
: The authors declare that they have no competing interests.