Funding for this research was provided by:
Public Ministry of Labor Campinas (X)
Received: 7 October 2019
Accepted: 17 February 2020
First Online: 22 February 2020
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Barretos Cancer Hospital, Barretos, SP, Brazil (950/2015) and conducted in accordance with the Declaration of Helsinki. Written informed consent was obtained from all involved patients before data and sample collection.
: Not applicable.
: The authors declare that they have no competing interests.