Received: 17 March 2020
Accepted: 20 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: This study was exempt from approval by an Ethics Committee, taking into consideration that participants provide a signed informed consent for all the analyses that the laboratory, contracted by the work place of the participant, will have to perform. The informed consent stipulates that data obtained through all the procedures may be used for scientific studies providing that they are anonymous and they comply with General Data Protection Regulation (EU) 2016/679 (GDPR). The samples used in the study were not obtained for additional analysis to be made but for the regular check-ups with which the participants agreed by signing the informed consent.
: Not applicable.
: The authors declare that they have no competing interests.