1. Japanese Red Cross Central Blood Center, Tokyo
2. Shinshu University School of Medicine, Matsumoto
3. Faculty of Medicine, The University of Tokyo, Tokyo
4. Yamanashi Medical College, Tamaho
5. Okayama University Medical School, Okayama
6. Nagasaki Chuo National Hospital, Ohmura, Japan
7. Chiron Corporation, Emeryville, California
8. The Japanese Red Cross Medical Center, Tokyo, Japan