1. Médecins Sans Frontières, Noma Children's Hospital, Sokoto, Nigeria
2. Department of Public Health Medicine, University of Cape Town, Anzio Road, Observatory, Cape Town, South Africa
3. Médecins Sans Frontières, Amsterdam, the Netherlands
4. Department of Otorhinolaryngology, Ochsner Health System, New Orleans, LA, USA
5. Department of Dental and Maxillofacial Surgery, Usmanu Danfodiyo University Teaching Hospital, Sokoto, Nigeria
6. Faculty of Dental Sciences, College of Health Sciences, Usmanu Danfodiyo University, Sokoto, Nigeria
7. Médecins Sans Frontières, Abuja, Nigeria
8. Centre for Infectious Disease Epidemiology and Research, School of Public Health and Family Medicine, University of Cape Town, South Africa
9. Department of Medical Microbiology, Radboud University Medical Center, Nijmegen, the Netherlands