Funding for this research was provided by:
Science and Technology Cooperation Project of GuiZhou Province of China (LH7006)
Science and Technology Project of GuiZhou Province of China (SY3044)
Science and Technology Cooperation Project of GuiZhou Provincial Health and Family Planning Commission (gzwjkj2015-1-025)
2017 Youth Fund of Xiangya Hospital of Central South University (2017Q07)
Text and Data Mining valid from 2018-05-30
Received: 5 December 2017
Accepted: 17 April 2018
First Online: 30 May 2018
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of People’s Hospital of Guizhou Province and Xiangya Hospital of Central South University. Written informed consent was obtained from each subject.
: All patients included in the study provided their informed consent at enrolment and the use of patients’ data for research.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.