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Journal, John Wiley & Sons, Inc., Hoboken, USA
M. Richardson, Dept of Radiology, University of Washington, USA
Emedicine.medscape, WebMD LLC, New York, USA
Journal, MeDitorial, Czech Medical Society, Prague, Czech Republic free abstracts, registration needed for full-text articles, in Czech
Journal, BioMed Central, London, UK
Chicago, USA
Canadian Association of Cardiovascular Prevention and Rehabilitation, Markham, Canada
Indianapolis, USA
Mayo Clinic, Rochester, MN, USA
Medical Education Network, Loyola University, Baltimore, USA, last update 1996
About, Inc., NY, USA