A = consistent, good-quality patient-oriented evidence; B = inconsistent or limited-quality patient-oriented evidence; C = consensus, disease-oriented evidence, usual practice, expert opinion, or case series.
An LED driver is the power supply for an LED system, much like a ballast is to a fluorescent or HID lighting system, says Al Marble, manager - sales & market development for Philips-Advance Transformer.
a backseat driver. a backseat driver. 1. a passenger in a car who continuously tells the driver how they should drive Mike's a real backseat driver and I find it so irritating. 2. (mainly American) someone who expects to control things although it is not their responsibility to do this Tell her you're in charge now.