Article History
Received: 4 September 2017
Accepted: 22 January 2018
First Online: 30 January 2018
Ethics approval and consent to participate
: The study complied with the Declaration of Helsinki and was reviewed and approved by the Human Subjects Committee of Changzhou No. 2 People’s Hospital approved this study. Written informed consent was obtained from the each people enrolled in the study.
: This manuscript does not include any individual person’s data.
: The authors declare that they have no competing interests.
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