1. Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht-Strasse 74, 20359 Hamburg, Germany.
2. Department of Parasitology, Institut Pasteur, 28 Rue du Dr. Roux, 75724 Paris Cedex 15, France.
3. Department of Biochemistry, Federal University of Sao Paulo, Rua Tres de Maio, 04044-020, Sao Paulo, Brazil.
4. Department of Hepatobiliary Surgery, University Hospital Hamburg-Eppendorf, Martinistrasse 52, 20246 Hamburg, Germany.