Article History
Accepted: 26 April 2021
First Online: 26 May 2021
Declarations
:
: All authors declare that they have no conflict of interest.
: This retrospective study involving human participants was in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declarations and its later amendments or comparable ethical standards.
: Informed consent was obtained from all workers being included in the study.