1. Department of Pediatrics, University of North Carolina at Chapel Hill, 101 Manning Drive, CB 7596, Chapel Hill, NC 27514, USA
2. School of Public Health, University of Kinshasa, Kinshasa 11850, Democratic Republic of the Congo
3. Laerdal Medical, 4002 Stavanger, Norway
4. RTI International, Research Triangle Park, Durham, NC 27709, USA
5. American Academy of Pediatrics, Itasca, IL 60143, USA
6. Department of Pediatrics, University of Washington, Seattle, WA 98195, USA