1. Department of General Internal Medicine, Niigata City General Hospital, Niigata, Japan
2. Department of Emergency and Critical Care Medicine, Niigata City General Hospital, Niigata, Japan
3. Department of Neurology, Niigata City General Hospital, Niigata, Japan
4. Department of Pulmonology, Niigata City General Hospital, Niigata, Japan
5. Department of Orthopedic Surgery, Niigata City General Hospital, Niigata, Japan