1. Academic Medical Center, University of Amsterdam; Department of Clinical Epidemiology, Biostatistics and Bioinformatics; Amsterdam Netherlands 1100 DD
2. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; Cape Town South Africa
3. Hanze University Groningen; Department of Speech and Language Pathology; Eyssoniusplein Groningen Netherlands
4. University Medical Center Utrecht; Julius Center for Health Sciences and Primary Care; PO Box 85500 Utrecht Netherlands 3508 GA Utrecht
5. Leiden University Medical Center; Department of Parasitology; PO Box 9600 Leiden Netherlands 2300 RC
6. Institute of Tropical Medicine; Department of Biomedical Sciences; Nationalestraat 155 Antwerp Belgium 2000
7. Imperial College London; Department of Infectious Disease Epidemiology; St. Mary's Campus, Norfolk Place London UK W2 1PG