Efficacy of cholinesterase inhibitors and memantine on symptoms not responsive to levodopa in patients affected by Parkinson’s disease without dementia: a systematic review by Pietro Cortelli, Maria Guarino, Giovanna Calandra-Buonaura, Giulia Giannini, Pietro Guaraldi, Francesco Nonino, Ilaria Cani, Nicola Grotteschi, Luca Baldelli, Monia Donati, Maria Domenica Camerlingo, Luisa Sambati

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