Medical Problems of MusiciansNEJM 320:221-227, 246-2481989., Lockwood,A.H., 1989
Peripheral DystoniaArch Neurol 43:830-832, Scherokman,B.,et al, 1986
Spasmodic DysphoniaLancet 2:1192, Gowers,W.R.,et al, 1984