Funding for this research was provided by:
National Natural Science Foundation of China (81970083, 81570084 and 81270144)
Article History
Received: 20 June 2019
Accepted: 6 December 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: This study was reviewed and approved by the Ethics Committee of Tianjin Medical University General Hospital. Informed consent was waived because this was a retrospectively study. We obtained patient data from the Medical Records and Statistics Room. We analysed the data anonymously. The use of the raw data was permitted by the Ethics Committee of Tianjin Medical University General Hospital.
: Not applicable.
: The authors declare that they have no competing interests.