Funding for this research was provided by:
National Natural Science Foundation of China (81674018, 81373676)
Received: 23 February 2020
Accepted: 24 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: This study was approved by the Health Authorities and Ethics Committees of Shandong University of Traditional Chinese Medicine Affiliated Hospital. All participants signed an informed consent form prior to the study.
: Not applicable.
: The authors declare that they have no competing interests.