[1] Intituut Trop Geneeskunde, Unit Mol Parasitol, B-2000 Antwerp, Belgium
[2] Univ Peruana Cayetano Heredia, Inst Med Trop Alexander Humboldt, Lima 100, Peru
[3] Univ Maastricht, Dept Mol Genet, NL-6200 MD Maastricht, Netherlands
[4] Univ Peruana Cayetano Heredia, Fac Ciencias & Filosofia, Dept Bioquim Biol Mol & Farmacol, Lima 100, Peru