Varies: Unfortunately, there is no correct answer to this. It really varies and depends on various factors, including the type of mutation a patient may have. Symptoms may start soon after birth, or years later.
Answered 10/26/2017
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Birth : Most cases are diagnosed at birth, although rare cases show up in their 20s or even 30s.
Answered 10/26/2017
5.7k views
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