An ERD (Entity Relationship Diagram) is a graphical representation of the data in rest within a system (e.g. a business, an organization, an application) that is subject to analysis.
The U.S. EPA established the Reference Dose (RfD) Work Group to address these concerns. In preparing this report, the RfD Work Group has drawn on traditional report on risk assessment (NRC, 1983), to more fully articulate the use of noncancer, nonmutagenic experimental data in reaching regulatory decisions about the significance of exposures to chemicals.
Radiofrequency Ablation Radiofrequency ablation (RFA, also called Radiofrequency neurotomy or lesioning) is a minimally invasive procedure used to reduce facet joint pain in the back or neck. An electrical current produced by a radio wave is used to heat up a small area of nerve tissue, thereby decreasing the ability of those nerves to transmit pain signals from that specific area to the brain.