1 National Institute of Public Health and the Environment - RIVM, 3720 BA Bilthoven, The Netherlands.
2 European Department for the Quality of Medicines, Council of Europe, 67029 Strasbourg Cedex 1, France.
3 ECVAM, JRC Institute for Health and Consumer Protection, 21020 Ispra, Italy.
4 Institute of Virology and Immunoprophylaxis, 3147 Mittelhäusern, Switzerland.
5 Paul-Ehrlich Institute, Paul-Ehrlich-Strasse 51-59, 63207 Langen, Germany.
6 SmithKline Beecham Biologicals SA, Belgium.
7 Department of Biological Standardisation, Scientific Institute of Public Health, Ministry of Social Affairs, Health and Environment, Brussels, Belgium.
8 Netherlands Centre Alternatives to Animal Use, Utrecht, The Netherlands.
9 Trawsnant, Cross Inn, Llandysul, Dyfed, UK.
10 World Health Organization - Vaccine Supply and Quality Unit, Geneva, Switzerland.
11 National Institute for Biological Standards and Control, Potters Bar, Hertfordshire, UK.
12 Bath, UK.
13 Laboratório National de Investigação Veterinária, Lisbon, Portugal.