Cox, Johnson, and Alexander (2012) report cochlear dead regions (DRs) occur when inner hair cells at a given frequency are lost or malfunctioning. Previous publications have suggested hearing-aid high-frequency gain should be attenuated in the presence of high frequency DRs.
Precondition for a VdS approval procedure, among others, is proof of a certified quality management system in accordance with DIN EN ISO 9001 for the manufacturing facility of the product.
VAWD accreditation is vital in protecting the public from contaminated, diverted or counterfeited drugs, and is recognized by 21 states as a means of implementing their state pharmacy laws, with additional states requiring the VAWD accreditation as a component of state licensure.