[1] Inst Trop Med, B-2000 Antwerp, Belgium
[2] Univ Antwerp Hosp, Antwerp, Belgium
[3] Clin St Pierre, Ottignies, Belgium
[4] Catholic Univ Louvain, St Luc Hosp, B-1200 Brussels, Belgium
[5] Robert Koch Inst, D-1000 Berlin, Germany
[6] Bernhard Nocht Inst Trop Med, Hamburg, Germany
[7] MRC, Clin Serv, Fajara, Gambia