Description:Dr T. S. van der Werf, Department of Internal Medicine, University Hospital, Groningen,. Pays-Bas. Dr Ken-ichiro Dr Mikihisa Yajima, Department of Pathology, Nippon Medical School, Tokyo, Japon Dr John Stanford, Catriona Hargreaves Charitable Trust, Teston, Maidstone, Royaume-Uni. Mlle Ellen