Clinical Survey Study to Evaluate Biomarkers and Clinical Manifestations in Individuals With Glycogen Storage Disease Type III (GSD III)

• Confirmed historical diagnosis of GSD III based on pathogenic mutations in the AGL gene on both alleles or GDE deficiency based on biopsy of liver, muscle, or fibroblasts

• Willing to comply with all study procedures

• Willing and able to provide written informed consent. If a minor, willing and able to provide written assent and have a legally authorized representative willing and able to provide written informed consent