Received: 20 May 2019
Accepted: 4 September 2019
First Online: 13 September 2019
Ethics approval and consent to participate
: Ethical approval was obtained from Ethical Committee of Environmental and Occupational Health and Safety department. After explaining the purpose of the study, written consent was obtained from each study participants. Any potential identifiers were eliminated to ascertain confidentiality.
: Not applicable.
: The authors declare that they have no competing of interests.