Multicenter trial on mother-to-infant transmission of GBV-C virus. The Lombardy Study Group on Vertical/Perinatal Hepatitis Viruses Transmission. - Zanetti AR; Tanzi E; Romanó L; Principi N; Zuin G; Minola E; Zapparoli B; Palmieri M; Marini A; Ghisotti D; Friedman P; Hunt J; et al. (Journal of medical virology, 1998)