Vernazza, Pietro L.; Kashuba, Angela D. M.*; Cohen, Myron S.*
Divisions of Infectious Diseases, Cantonal Hospital St. Gallen, Switzerland and *University of North Carolina at Chapel Hill, North Carolina, USA
Address for correspondence: Dr Pietro Vernazza, Infectious Disease, Department of Medicine, Cantonal Hospital, 9007 St. Gallen, Switzerland. Fax: +41 71 494 6114. e-mail: [email protected]