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<p>The primary objective of the study is:</p>
<p>• To provide patients with <strong>LEMS/CMS/downbeat nystagmus</strong> access to <strong>amifampridine phosphate therapy</strong> where physicians would like to treat with amifampridine phosphate</p>
<p>The secondary objective of the study is:</p>
<p>• To assess the long-term safety of amifampridine phosphate in patients with LEMS/CMS/downbeat nystagmus</p>