Univ Parma, Azienda Osped Univ Parma, Dept Surg Sci, Anesthesia Intens Care Serv, I-43100 Parma

Hepatitis B&C Publ Policy Assoc Maroussi, Athens, Greece

Natl Drug Coordinator Lithuania, Vilnius, Lithuania

Yale Univ, Sch Med, Med, New Haven, CT 06520 USA

Dept Hlth, London SE1 6TE, England

Natl Observ & Int Relat, Rome, Italy