1. Graduate School of Medicine, Keio University, Tokyo 160-8582, Japan
2. Medical Governance Research Institute, Tokyo 108-0074, Japan
3. Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan
4. American School in Japan, Tokyo 182-0031, Japan
5. Navitas Clinic, Tokyo 190-0012, Japan
6. Department of Breast and Thyroid Surgery, Jyoban Hospital of Tokiwa Foundation, Fukushima 972-8322, Japan