Prevalence of GBV C/HGV RNA and GBV C/HGV antibodies in French volunteer blood donors: results of a collaborative study. - Mercier B; Barclais A; Botte C; Cantalube J; Coste J; Defer C; Gautreau C; Giannoli C; Halfon P; Lepot I; Loiseau P; Martial J; et al. (Vox sanguinis, 1999)