Botulinum toxin injection for spasmodic torticollis: increased magnitude of benefit with electromyographic assistance.
                             
                            
                            
                                
                            
                            
                                
                            
                            
                            
                                
                                    
                                            
    Botulinum toxin injection for spasmodic torticollis: increased magnitude of benefit with electromyographic assistance. Neurology. 1992 Apr; 42(4):878-82.