Funding for this research was provided by:
Uniwersytet Medyczny w Lodzi (502-03/3-012-03/502-34-050, 502-03/3-012-03/502-34-071)
Received: 19 October 2017
Accepted: 29 May 2019
First Online: 10 June 2019
Ethics approval and consent to participate
: Not applicable. In the study, informed consent was not needed because of the classification of the tested samples as medical wastes according to local “Pharmaceutical Law Act”. Also the approval of IRB (i.e. “Bioethical Committee concerning the studies on human”) was not required as in line with its regulations it is needed when the study is a medical experiment. We did not do any intervention on human health, so that according to local law, the study was not a “medical experiment”.
: Not applicable.
: The authors declare that they have no competing interests.