Funding for this research was provided by:
National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2015BAI13B01)
Key Research & Development Programs of Shaanxi Province (2018ZDXM-SF-052)
Text and Data Mining valid from 2019-01-05
Received: 25 August 2018
Accepted: 27 December 2018
First Online: 5 January 2019
Ethics approval and consent to participate
: Participants agreed to join this research and were able to cooperate to complete the questionnaire survey. For illiterate participants, their relatives agreed on the informed consent. The study was approved by the Medical Ethics Committee of the First Affiliated Hospital of Xi’an Jiaotong University.
: All the participants provided written informed consent for the publication of the results of this study.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.