1. Parkinson's Disease and Movement Disorders Center; Department of Neurology, Mayo Clinic College of Medicine; Mayo Clinic; Scottsdale Arizona USA
2. Banner Sun Health Research Institute; Sun City Arizona USA
3. Department of Biostatistics; Mayo Clinic College of Medicine, Mayo Clinic; Scottsdale Arizona USA
4. Department of Otolaryngology; Mayo Clinic; Phoenix Arizona USA
5. Arizona State University; Tempe Arizona USA