a Movement Disorders Center of Arizona, 9590 E. Ironwood Square Drive, Suite 225, Scottsdale, AZ 85258, USA
b The Parkinson’s and Movement Disorder Institute, 9940 Talbert Avenue, Fountain Valley, CA 92708, USA
c Department of Neurology, Baylor College of Medicine, Smith Tower, 18th Floor, 6550 Fannin, Suite 1801, Houston, TX 77030, USA
d Department of Neurological Sciences, Rush University Medical Center, 1725 West Harrison Street Suite 755, Chicago, IL 60612, USA
e Merz Pharmaceuticals GmbH, Eckenheimer Landstrasse 100, 60318 Frankfurt, Germany