1. Multidisciplinary Pain Center, Aichi Medical University, Nagakute, Japan
2. Medical Science Department, Medical Affairs Division, Daiichi Sankyo Co., Ltd, Tokyo, Japan
3. Biostatistics & Data Management Department, Research and Development Division, Daiichi Sankyo Co., Ltd, Tokyo, Japan
4. Sales Planning Group, Japan Medical Research Institute Co., Ltd., Tokyo, Japan
5. Educational Training & Medical Information Department, Nihon Chouzai Co., Ltd., Tokyo, Japan
6. The Agent LLC., Tokyo, Japan