Impact of COVID-19 pandemic on Parkinson´s Disease: a cross-sectional survey of 568 Spanish patients (2020) Dokumentu-zerrenda https://onlinelibrary.wiley.com/doi/epdf/10.1002/mds.28261 Xehetasunak Impact of COVID-19 pandemic on Parkinson´s Disease: a cross-sectional survey of 568 Spanish patients (2020)