On Valve's website sits a profile page, and on that profile page sits an entry for Left 4 Dead writer Chet Faliszek. It reads: "We are all still trying to figure out exactly what it is that Chet does ...

While moderate or severe mitral regurgitation (MR) may increase early mortality in patients undergoing transcatheter aortic valve replacement (TAVR), late mortality appears unaffected, with MR ...