The purpose of this research is to study the natural history of congenital disorders of glycosylation and its causes and treatments.
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Indicators of Disease Severity and Progression - organ system involvement
Timeframe: Length of study, up to 5 years
Indicators of Disease Severity and Progression - degree of cognitive disability
Timeframe: Length of study, up to 5 years
Indicators of Disease Severity and Progression - case-fatality
Timeframe: Length of study, up to 5 years