The purpose of this study is to evaluate how well a new drug called Dysport NG works and how safe it is, when it is used for the treatment of cervical dystonia. Dysport NG will be compared to an approved drug called Dysport.
The purpose of this study is to evaluate how well a new drug called Dysport NG works and how safe it is, when it is used for the treatment of cervical dystonia. Dysport NG will be compared to an approved drug called Dysport.