Below are a collection of excerpts from biomedical research articles. Excerpts are separated by newlines. Your task is to answer a question based these excerpts. Your response should be formatted as a `json` array.

For instance, given excerpts from articles studying breast cancer, and the question "what are some common genes associated with breast cancer?", an answer might be formatted like: ["BRCA1", "BRCA2", "TP53", ...]. Only include answers that are mentioned in the provided exerpts. The array should always have at least one answer; do not respond with an empty array []. Do not include any text in your response other than the answer array.

Context: We describe a unique case of a 23-yr-old female patient affected by a homozygous loss of function mutation in the L-ferritin gene, idiopathic generalized seizures, and atypical restless leg syndrome (RLS).
The genotypes of five specific single-nucleotide polymorphisms (SNPs) in three genes that have been previously associated with iron status and/or restless leg syndrome (RLS)
Homozygosity for the T-allele of BTBD9 rs9296249 was associated with lower serum ferritin.
A frequent polymorphism in BTBD9 was significantly associated with serum ferritin. This polymorphism has previously been associated with RLS, but not low iron stores in blood donors.
In the German sample, variants in MEIS1 and BTBD9 were associated with RLS in ESRD (P(nom)≤0.004, ORs 1.52 and 1.55), whereas, in the Greek sample, there was a trend for association to MAP2K5/SKOR1 and BTBD9
This is the first demonstration of a genetic influence on RLS in ESRD patients with BTBD9 being significantly associated.
Four family members developed dopa-responsive dystonia, with onset in their late teens, and subsequently developed restless leg syndrome and migraine. CONCLUSIONS: This is the first report of an intragenic guanosine triphosphate cyclohydrolase-1 duplication in a dopa-responsive dystonia family.
To date, no gene mutation has been found, but five gene loci have been mapped in primary RLS to chromosomes 12q, 14q, 9p, 2q, and 20p (RLS1 through 5)
We demonstrate linkage to a locus on chromosome 9p that is probably distinct from RLS3. Our family with a rather homogeneous phenotype and very early disease onset represents a unique opportunity to further elucidate the genetic causes of the frequent restless leg syndrome.
A case of restless leg syndrome in a family with LRRK2 gene mutation.
The association between RLS and LRRK2 gene mutation may be casual, but it can hypothesized that RLS is a possible phenotypic presentation in PARK8.

Question:
Which genes have been found to be associated with restless leg syndrome
["LRRK2 gene mutation", "Human L-Ferritin", "The genotypes of five specific single-nucleotide polymorphisms (SNPs) in three genes", "Homozygosity for the T-allele of BTBD9 rs9296249", "MEIS1", "Intragenic guanosine triphosphate cyclohydrolase-1 duplication"]