Mild dopa-responsive dystonia in heterozygous tyrosine hydroxylase mutation carrier: Evidence of symptomatic enzyme deficiency? Response from the authors.

Lang AE Edmond J. Safra Program in Parkinson's Disease and Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, Toronto, Canada. Electronic address: lang@uhnresearch.ca.
Bally JF Edmond J. Safra Program in Parkinson's Disease and Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, Toronto, Canada; Department of Neurology, University of Geneva and University Hospitals of Geneva, Geneva, Switzerland.
Breen DP Edmond J. Safra Program in Parkinson's Disease and Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, Toronto, Canada; Centre for Clinical Brain Sciences, University of Edinburgh, Edinburgh, UK; Anne Rowling Regenerative Neurology Clinic, University of Edinburgh, Edinburgh, UK; Usher Institute of Population Health Sciences and Informatics, University of Edinburgh, Edinburgh, UK.
Schaake S Institute of Neurogenetics, University of Lübeck, Lübeck, Germany.
Trinh J Institute of Neurogenetics, University of Lübeck, Lübeck, Germany.
Rakovic A Institute of Neurogenetics, University of Lübeck, Lübeck, Germany.
Klein C Institute of Neurogenetics, University of Lübeck, Lübeck, Germany.