1. Member of the council of the Asia & Oceania Thyroid Association (AOTA).
2. Director, Atomic Bomb Disease Institute, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.
3. AOTA advisory member to the World Thyroid Foundation.
4. Kuma Hospital, Kobe, Japan.
5. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.