Todor A Popov1, Grigoriy Garyuk2, Igor Kaydashev3, Svitlana Kharkivska4, Yasuo Ohashi5, Kimihiro Okubo6
(1.Department of Occupational Disease, University Hospital Sv. Ivan Rilskipational, Bulgaria, 2.Private Enterprise “Garyuk”, Ukraine, 3.1st City Clinical Hospital of Poltava City Council, Ukraine, 4.Medical Center “Family Health”, Ukraine, 5.Department of Integrated Science and Engineering for Sustainable Society, Chuo University, Japan, 6.Department of Otorhinolaryngology, Nippon Medical School, Japan)
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