The MTHFR C677T polymorphism modifies age at onset in Parkinson's disease. - Vallelunga, Annamaria; Pegoraro, Valentina; Pilleri, Manuela; Biundo, Roberta; Iuliis, Angela; Marchetti, Mauro; Facchini, Silvia; Formento Dojot, Patrizia; Antonini, Angelo (Neurological Sciences, 2014)