Post-marketing Surveillance of Administration of Botulinum Toxin Type B(NerBloc)-Investigation of the Clinical Condition in Patients With Change From Botulinum Toxin Type A

Investigation of the clinical condition in patients with cervical dystonia by Toronto Western Spasmodic Torticollis Scale (TWSTRS)

Inclusion criteria:

Patients with cervical dystonia who was treated by botulinum toxin type A in the past.

Patients who was enrolled in NB01S and was evaluated by TWSTRS at the first injection of NerBloc.