1. Vocational School of Health Services, Cumhuriyet University, Sivas, Turkey;
2. Department of Chemistry, Faculty of Arts and Sciences, Gaziosmanpasa University, Tokat, Turkey;
3. Vocational School, Occupational Health and Safety Programme, Istanbul Arel University, Istanbul, Turkey;
4. Department of Chemistry, Faculty of Science, Atatürk University, Erzurum, Turkey