1. Department of Rehabilitation, Toho University Sakura Medical Center, 564-1, Shimoshizu, Sakura, Chiba 285-8741, Japan
2. Graduate School of Health Sciences, Saitama Prefectural University, 820, Sannomiya, Koshigaya, Saitama 343-8540, Japan
3. Department of Internal Medicine, Toho University Sakura Medical Center; 564-1, Shimoshizu, Sakura, Chiba 285-8741, Japan