Alcalay RN, Levy OA, Waters C, Fahn S, Ford B, Kuo SH, Mazzoni P, Marder K, Pauciulo MW, Nichols WC, Gan-Or Z, Rouleau GA, Chung WK, Wolf P, Oliva P and Zhang XK. Glucocerebrosidase activity in Parkinson disease with and without GBA mutations. Brain. 2015. PubMed