Unsupervised Walking Activity Assessment Reveals COVID‐19 Impact on Parkinson's Disease Patients. Issue 3 (27th January 2021) - Vila‐Viçosa, Diogo; Clemente, Ana; Pona‐Ferreira, Filipa; Leitão, Mariana; Bouça‐Machado, Raquel; Kauppila, Linda A.; Costa, Rui M.; Matias, Ricardo; Ferreira, Joaquim J.