1. Scientific Directorate (M.M., G.B.), “Bambino Gesù” Hospital and Research Institute, Instituto di Ricovero e Cura a Carattere Scientifico, I-00165 Rome, Italy
2. Microbiology Unit (L.P.), “Bambino Gesù” Hospital and Research Institute, Instituto di Ricovero e Cura a Carattere Scientifico, I-00165 Rome, Italy