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Funding This study was supported by grants from Jiangsu Province Ke Jiao Xin Wei Program, Jiangsu Province Natural Science Foundation (BK2009034), Nanjing Health Bureau Young Scientists Launching Project (QYK09174) and Jiangsu Province Health Research Program (LW201009).
Competing interests None.
Patient consent Obtained.
Ethics approval This study was conducted with the approval of the Affiliated Drum Tower Hospital of Nanjing University Medical School.
Provenance and peer review Not commissioned; internally peer reviewed.
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