Joy Milne, who hails from Perth, Scotland, was able to smell her husband's Parkinson's disease years before he was diagnosed with the condition ...

Department of Chemistry, School of Natural Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio, 80, Napoli 80125, Italy ...