What is mitral valve stenosis?
Mitral valve stenosis is a heart problem in which the mitral valve doesn't open as wide as it should and is a lifelong disease. When it 1st develops, you most likely have no symptoms & notice no changes. Symptoms develop over 10 to 20 years or more.
Answered by Mel C. -
About Valve
Valve is an American video game developer and distributor founded by Gabe Newell and Mike Harrington in 1996. Their first game, Half-Life, was incredibly popular and spurred the development of the company. Currently their online distribution software, Steam, is enjoying great success with over 30 million active users. Valve is also well known and liked for often giving away new content and updates to their games for free.
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