1. Unit of Health Economics, WifOR Institute, Darmstadt, Hesse, Germany
2. Unit of Public Health and Preventive Medicine, Yokohama City University School of Medicine, Yokohama, Japan
3. Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
4. Unit of Otorhinolaryngology, Futaba Clinic, Tokyo, Japan
5. Unit of Health Economics, Novartis Pharma K.K, Tokyo, Japan
6. Novartis Corporation Sdn. Bhd, Selangor, Malaysia
7. School of Medicine, International University of Health and Welfare, Narita, Japan