Text and Data Mining valid from 2019-12-01
Received: 1 September 2019
Accepted: 25 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: Informed consent from patients or their guardians before participating in the study and approval from the Ethics Committees of Nanfang Hospital were obtained.
: Not applicable.
: The authors declare that they have no competing interests.