Received: 13 November 2019
Accepted: 18 December 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: A total of 42 patients with NB who had not received any chemotherapy and radiotherapy before surgery were recruited from the First Affiliated Hospital of Zhengzhou University. All participants have signed informed consent and the work was accepted by the Research Ethics Committee of the First Affiliated Hospital of Zhengzhou University.
: Not applicable.
: The authors declare that they have no competing interests.