Funding for this research was provided by:
National Natural Science Foundation of China (81641115)
CAMS Innovation Fund for Medical Sciences (2017-I2M-1-006)
Received: 4 December 2017
Accepted: 4 December 2018
First Online: 20 December 2018
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Ethics Committee of the National Cancer Center/Cancer Hospital. All the patients were required to sign an informed consent form explaining the risks of FNA before the FNA examination. At this time, they also gave their informed consent to the present study by signing the paper's informed consent form.
: Not applicable.
: The authors declare that they have no competing interests.
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