1. School of Public Health; University of Bielefeld; Bielefeld Germany
2. Department of Biological, Environmental, Occupational Health Sciences; University of Ghana; Accra Ghana
3. Infectious Disease Epidemiology Unit; Bernhard Nocht Institute for Tropical Medicine; Hamburg Germany
4. Medical Clinic I; University Clinic Hamburg Eppendorf; Hamburg Germany
5. Kumasi Centre for Collaborative Research; Kumasi Ghana
6. Center for Infectious Disease Control; National Institute for Public Health and the Environment; Bilthoven Netherlands
7. Department of Social and Behavioural Sciences; University of Ghana; Accra Ghana