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.
drug intended for use in animal feed which requires professional supervision (oversight) of a licensed veterinarian is a VFD drug â¢In 2000 FDA finalized regulations for authorization, distribution and use of VFDs