Collection and review of clinical information related to glycogen branching enzyme (GBE) deficiency, diagnosed as Glycogen Storage Disease Type IV (GSD IV) or Adult Polyglucosan Body Disease (APBD generated during clinic visits.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Progression of disease
Timeframe: Duration of study, approximately 10 years