1 Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium. Electronic address: lliesenborghs@itg.be.
2 Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.
3 Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium; Division of Infectious Diseases and HIV Medicine, University of Cape Town, Cape Town, South Africa.
4 Clinical Virology Unit, Department of Clinical Sciences, Institute of Tropical Medicine, Antwerp, Belgium.