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There are fifteen distinct glycogen storage diseases. Although glycogen synthase deficiency does not result in storage of extra glycogen in the liver, it is usually classified with the GSD Type 0 because it is another defect of glycogen storage and can cause similar problems. The overall frequency of glycogen-storage disease has been established approximately 1:20,000 to 25,000 people worldwide.

TABLE G-3Glycogen Storage Disease (GSD): An Overview

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