The V471A polymorphism in autophagy-related gene ATG7 modifies age at onset specifically in Italian Huntington disease patients. oleh Silke Metzger, Carolin Walter, Olaf Riess, Raymund A C Roos, Jørgen E Nielsen, David Craufurd, REGISTRY Investigators of the European Huntington’s Disease Network, Huu Phuc Nguyen