Funding for this research was provided by:
the Research Fund for Public Welfare, the National Health and Family Planning Commission of China (201402005)
the Clinical Research Fund of Chinese Medical Association (15010010589)
Received: 5 June 2019
Accepted: 13 January 2020
First Online: 30 January 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of the First Affiliated Hospital of China Medical University. Informed written consent was obtained from all participants before data collection.
: Not applicable.
: The authors declare that they have no competing interests.