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Claas, E.C.J., Jong, J.C. de, Bartelds, A.I.M., Bijlsma, K., Rothbarth, P., Groot, R. de, Rimmelzwaan, G.F., Osterhaus, A.D.M.E. Influenza types and patient population. Lancet: 1995, 346(8968) 180. Ingezonden brief.