Smith, N., D. M. Gaunt, A. Whone, Y. Ben-Shlomo, and E. J. Henderson. “The Association Between Frailty and Parkinson’s Disease in the ReSPOnD Trial”. Canadian Geriatrics Journal, vol. 24, no. 1, Feb. 2021, pp. 22-25, doi:10.5770/cgj.24.437.