Received: 27 March 2019
Accepted: 24 October 2019
First Online: 15 November 2019
Ethics approval and consent to participate
: This study was conducted in accordance with the declaration of Helsinki. This study was conducted with approval from the Ethics Committee of the First Affiliated Hospital of Guangxi Medical University. Written informed consent was obtained from the participants.
: Not applicable.
: The authors declare that they have no competing interests.