Classification system and case definitions of Toxoplasma gondii infection of immunocompetent pregnant women and their congenitally infected offspring. - Lebech,M.; Joynson,D.HM.; Seitz,H.M.; Thulliez,P.; Gilbert,R.E.; Duttose,G.N.; Øvlisen,B.; Petersen,E. (Eur J Clin Microb Inf Dis, 1996)