1.This refers to the use of a miniature BTE hearing aid that is coupled to an ear insert or earmold (vented or unvented) via a tubing of approximately 0.8 mm inner diameter.
1.Fossil fuel combustion, biomass burning, wildfires and unvented gas heaters are common sources of air pollutants. A large cohort study in never smokers showed a strong association between ambient fine particulate matter concentration and lung cancer mortality.