| ARD | Aortic root dilatation |
| AVA | Aortic valve annulus |
| BSA | Body surface area |
| CHOC | Children’s Hospital of Orange County |
| CI | Confidence interval |
| ERT | Enzyme replacement therapy |
| GAGs | Glycosaminoglycans |
| HSCT | Hematopoietic stem cell transplantation |
| MPS | Mucopolysaccharidosis |
| SoV | Sinuses of valsalva |
| STJ | Sinotubular junction |
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