[1] Bernhard Nocht Inst Trop Med, Clin Res Unit, D-20359 Hamburg, Germany
[2] Univ Hosp Dusseldorf, Dept Gastroenterol Hepatol & Infect Dis, D-40225 Dusseldorf, Germany
[3] Komfo Anokye Teaching Hosp, Directorate Med, Kumasi, Ghana
[4] Univ Med Ctr Hamburg Eppendorf, Infect Dis Unit, Dept Med 1, D-20246 Hamburg, Germany
[5] Kwame Nkrumah Univ Sci & Technol, Kumasi, Ghana
[6] James Cook Univ Hosp, Ctr Clin Infect, Middlesbrough TS4 3BW, Cleveland, England
[7] Northwest Reg Hosp, Bamenda, Northwest Regio, Cameroon
[8] Univ Bonn, Med Ctr, Inst Virol, D-53127 Bonn, Germany