Funding for this research was provided by:
National Natural Science Foundation of China (81300036, 31571179, 31600956)
Natural Science Foundation of Fujian Province (2018J06021, 2018J01828)
Young and Middle-aged Backbone Personnel Training Project of Fujian Health and Family Planning Commission (2018-ZQN-59)
Fujian Medical University Talent startup Fund (XRCZX2017003, XRCZX2017004)
Received: 17 February 2019
Accepted: 12 July 2019
First Online: 22 July 2019
Ethics approval and consent to participate
: This study was approved by the institutional review boards of all participating institutions, and written consent forms were obtained from all participants.
: All of the authors listed for this paper consent to the publication of this work.
: The authors declare that they have no competing interests.