1. Institut National de la Transfusion Sanguine (INTS); Département d'Études des Agents Transmissibles par le Sang; Centre National de Reference pour les Hepatites B et C en Transfusion; F-75015 Paris France
2. Section of Molecular Virology; Paul Ehrlich Institute; Langen Germany
3. Scientific Support Office; American Red Cross; Gaithersburg Maryland
4. Institute of Haematology and Transfusion Medicine; Warsaw Poland
5. Study Group of NAT Standardization under the Ministry of Health, Labor and Welfare of Japan (2001-2003); Tokyo Japan
6. Nacionalinis Kraujo Centras; Vilnius Lithuania
7. Shabrawishi Hospital; Cairo Egypt
8. Biologicals Quality Control; Rijswijk the Netherlands
9. Blood Systems Research Institute; San Francisco California
10. Lelie Research; Paris France