The goal of this study is to conduct a prospective, longitudinal study to observe the natural clinical progression and disease outcome of AS patients receiving no disease-modified intervention, with the purpose of obtaining data that will be useful for future clinical trials.
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Clinical Global Impression Scale for AS (CGI-AS)
Timeframe: 2 years
Hammersmith Neonatal Neurological Examination (HINE) (for 0-2 years)
Timeframe: 2 years