The Parkinson's disease e‐diary: Developing a clinical and research tool for the digital age. Issue 5 (22nd March 2019) - Vizcarra, Joaquin A.; Sánchez‐Ferro, Álvaro; Maetzler, Walter; Marsili, Luca; Zavala, Lucia; Lang, Anthony E.; Martinez‐Martin, Pablo; Mestre, Tiago A.; Reilmann, Ralf; Hausdorff, Jeffrey M.; Dorsey, E. Ray; Paul, Serene S.; et al.