1. First Division of Medicine, Pordenone General Hospital, Pordenone,
2. Division of Medical Oncology, Aviano Cancer Institute, Aviano,
3. Institute of Medicina Clinica, University of Trieste, Trieste,
4. Laboratory of Immunology, Microbiology and Virology, Pordenone General Hospital, Pordenone,
5. Fondo Studi Fegato, Trieste, and
6. Institute of Semeiotica Chirurgica, University of Trieste, Italy