1. Diabetic Neuropathy Project (Former ALS/Neuropathy Project); Department of Sensory and Motor Systems; Tokyo Metropolitan Institute of Medical Science; Setagaya-ku Tokyo 156-8506 Japan
2. Division of Diabetes, Metabolism & Endocrinology; Department of Internal Medicine; Jikei University School of Medicine; Minato-ku Tokyo Japan
3. Department of Pharmacology; National Research Institute for Child Health and Development; Setagaya Tokyo Japan