1. Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
2. UCB Pharma, Raleigh, NC, USA
3. UCB Pharma, Monheim am Rhein, Germany
4. UCB Pharma, São Paulo, Brazil
5. UCB Pharma, Atlanta, GA, USA
6. Seoul National University Hospital, Seoul, South Korea