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Encyclopedia Britannica Inc.
National Library of Medicine, Bethesda, USA
The Acronym Server by Silmaril Consultants
ARKive, Bristol, UK
American Heart Association, Dallas, USA
Wiley-VCH Verlag GmbH & Co. KGaA, Berlin, Germany
Wikipedia
Donna M. D'Alessandro, M.D. and Michael P. D'Alessandro, virtualpediatrichospital.org
DM. D'Alessandro, MP. D'Alessandro, University of Iowa, Iowa City, USA
MedPix, U.S. National Library of Medicine, Bethesda, USA