Olfaction in Parkin single and compound heterozygotes in a cohort of young onset Parkinson's disease patients

N. Malek (Corresponding Author), D. M. A. Swallow, K. A. Grosset, M. A. Lawton, C. R. Smith, N. P. Bajaj, R. A. Barker, Y. Ben-Shlomo, C. Bresner, D. J. Burn, T. Foltynie, H. R. Morris, N. Williams, N. W. Wood, D. G. Grosset, PRoBaND Investigators