1. Division Infectious Diseases, Toronto General Hospital, University of Toronto, 14EN 209, 200 Elizabeth Street, Toronto, Ontario M5G 2C4, Canada.
2. Department of Women's and Children's Health, International Maternal and Child health, Uppsala University, Sweden
3. Department of Global Public Health, Karolinska Institutet, Stockholm, Sweden
4. Health Sciences Library, University Health Network, Toronto, Canada.
5. Unité de Formation et de Recherche Biosciences, Université Félix Houphouët-Boigny, Abidjan, Côte d'Ivoire.
6. Department of Medical Laboratory Sciences, University of Cape Coast, Cape Coast, Ghana.