1. Department of Neurology, College of Medicine; Chung-Ang University; Seoul South Korea
2. Department of Preventive Medicine, College of Medicine; Chung-Ang University; Seoul South Korea
3. Department of Neurology; Seoul National University College of Medicine & Seoul National University Bundang Hospital; Seoul South Korea
4. Department of Orthopaedic Surgery, College of Medicine; Chung-Ang University; Seoul South Korea