The spectrum of nonmotor symptoms in early Parkinson disease
Tien K. Khoo
,
Alison J. Yarnall
,
Gordon W. Duncan
,
Tien K. Khoo
,
Alison J. Yarnall
,
Gordon W. Duncan
,
Shirley Coleman
,
John T. O’Brien
,
David J. Brooks
,
Roger A. Barker
,
David J. Burn
2013
Neurology
417 citations