1. Molecular Medicine Laboratory, International Center for Genetic Engineering and Biotechnology, 34012 Trieste, Italy.
2. Department of Biomedicine, University of Trieste, 34100 Trieste, Italy.
3. Istituto di Fisiologia Clinica, Area della Ricerca del Consiglio Nazionale delle Ricerche, Pisa, Italy.
4. Department of Internal Medicine, Institute of Nuclear Medicine, University of Genoa, 16132 Genoa, Italy.