C9orf72 expansions are the most common genetic cause of Huntington disease phenocopies

In the article “C9orf72 expansions are the most common genetic cause of Huntington disease phenocopies” by D.J. Hensman Moss et al. (Neurology® 2014;82:292–299), there is an omission in the Methods section under the subheading “Case ascertainment.” The third paragraph should read “All C9orf72-positive cases were given a modified Goldman score,^21,22 which was used to quantify the strength of the autosomal dominant family history (scoring was modified to give a score of 0 for no data, 4 for definitely no family history, and 4.5 for unknown or undescribed family history).” The full scoring system has been added to the supplemental data. The authors regret the omission.