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Journal, BioMed Central Ltd., London, UK
Medscape, WebMD LLC
National Guideline Clearinghouse, Rockville, USA
Journal, British Medical Journal Publishing Group, London, UK
M. P. Alessandro, Virtual Pediatric Hospital, University of Iowa, USA
Book, National Academy Press, Washington, USA, published 1999
Journal, John Wiley & Sons, Inc., Hoboken, USA, free abstracts, paid full-text articles
Journal, BMJ Publishing Group Ltd, London, UK