1. Bauchi branch Nigeria country office World Health Organization Bauchi city Nigeria
2. Division of Infectious Diseases Department of Pediatrics Tokyo Metropolitan Children’s Medical Center Tokyo Japan
3. Department of Community Medicine Aminu Kano Teaching Hospital Kano Nigeria
4. Division of Infectious Diseases and the Centre for Global Child Health The Hospital for Sick Children Toronto Ontario Canada
5. Department of Pediatrics Faculty of Medicine University of Toronto Toronto Ontario Canada