Funding for this research was provided by:
Xiamen Municipal Bureau of Science and Technology (3502Z20154006, 3502Z20199129)
Fujian Provincial key discipline Project (2018. 145)
Received: 20 December 2019
Accepted: 5 May 2020
First Online: 19 May 2020
Ethics approval and consent to participate
: Ethical approval was granted according to national requirements. This study was approved by the Medical Ethics Committee of the First Affiliated Hospital of Xiamen University and the Medical Ethics Committee of Xiamen Hospital of Traditional Chinese Medicine. Informed consent was waived because the study was conducted retrospectively and no interventions were applied.
: Not applicable.
: The authors declare that they have no competing interests.