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.
VFD Definitions â¢Veterinary Feed Directive (VFD) â â¢(7) A ââveterinary feed directiveââ is a written (nonverbal) statement issued by a licensed veterinarian in the course of the veterinarianâs professional practice that orders the use of a VFD drug or combination VFD drug in or on an