Funding for this research was provided by:
Development Center for Medical Science and Technology, National Health and Family Planning Commission of the People's Republic of China (W2013R60)
Article History
Received: 30 November 2018
Accepted: 1 March 2019
First Online: 14 March 2019
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Medical Ethics Committee of the Affiliated Hospital of Putian University.
: Due to the retrospective nature of this study the usual requirement for signed written informed consent forms was waived.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.