Funding for this research was provided by:
the Provincial Science Foundation of Hunan (2017JJ3499)
the Research project of Hunan health and Family Planning Commission (C20180785)
the Clinical and Rehabilitation Research Foundation of Xiangya Hospital and Weiming of Peking University (xywm2015II07)
the Fundamental Research Funds for the Central Universities of Central South University (2019zzts019 and 2019zzts809)
the Key Scientific Research and Innovation Projects of Hunan Postgraduates (CX20190074)
Text and Data Mining valid from 2019-08-28
Received: 10 June 2019
Accepted: 18 August 2019
First Online: 28 August 2019
Ethics approval and consent to participate
: This study has been approved by the Research Ethics Committee of Xiangya Hospital. The patients and their families were invited to participate and provided informed consent upon learning of the study’s risks and benefits.
: Figures in the manuscript have been published with the individuals’ consent.
: The authors declare that they have no competing interests.