Text and Data Mining valid from 2019-12-01
Received: 23 September 2019
Accepted: 12 November 2019
First Online: 10 December 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Tianjin Medical University General Hospital. Informed consent was taken from all patients.
: Not applicable.
: The authors declare that they have no competing interests.