Chronic Cough and CANVAS (Cerebellar Ataxia With Neuropathy and Bilateral Vestibular Areflexia Syndrome)

"To determine the presence of biallelic expansion of AAGGG in RFC1 in patients with chronic cough, regardless of the presence of neurological symptoms.~For the molecular study of the DNA sample of the patients, two techniques will be used: standard Polymerase chain reaction amplification with primers flanking the intron 2 fragment of the RFC1 gene and amplification using Repeated Primed Polymerase chain reaction in 3 independent reactions."