1. Occupational Medicine Department, University of Medicine, Pharmacy, Science and Technology of Targu-Mures, Romania;
2. Epidemiology Department, University of Medicine, Pharmacy, Science and Technology of Targu-Mures, Romania;
3. Mediconsult Medical Center, Tirgu-Mures, Romania;
4. Hygiene Department, University of Medicine, Pharmacy, Science and Technology of Targu-Mures, Romania;
5. Mures County Clinical Hospital, Tirgu-Mures, Romania