Reversible Chorea and Focal Dystonia in Vitamin B12 Deficiency
NEJM 347:295, Pacchetti,C.,et al, 2002
Dystonia and Chorea in Acquired Systemic Disorders
JNNP 65:436-445, Janavs,J.L.&Aminoff,M.J., 1998
Clinical Diagnosis of the Dyskinesias
Med Clin of North Am 56:1321, Duvoisin,R., 1972