Prevalence of H. pylori Infection in Family Members of H. pylori Positive Patients and its Influence on the Reinfection Rate after Successful Eradication Therapy: A Two-Years Follow-up - Knippig, C; Arand, F; Leodolter, A; Nilius, M; Bayerdörffer, E; Klein, U; Malfertheiner, P (Zeitschrift für Gastroenterologie, 2002)