Funding for this research was provided by:
Siberian Branch, Russian Academy of Sciences (0310-2018-0007)
Text and Data Mining valid from 2019-10-28
Received: 28 February 2019
Accepted: 12 September 2019
First Online: 28 October 2019
Ethics approval and consent to participate
: The cytological material was obtained in accordance with the legislation of the Russian Federation, written informed consent was obtained from each patient for its use, and the clinical data were depersonalized. The study protocol was approved by the Ethics Committee of N.N. Petrov National Medical Research Center of Oncology.
: Not applicable.
: The authors declare that they have no competing interests.