1. University of Occupational and Environmental HealthJapan
2. Tohoku University HospitalJapan
3. Osaka Medical CollegeJapan
4. Toho University Omori Medical CenterJapan
5. Okinawa Chubu HospitalJapan
6. Tokyo Metropolitan Bokutoh HospitalJapan
7. Kameda Medical CenterJapan
8. National University of SingaporeSingapore