Evidence-based critical ultrasound: a mission possible
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Guyatt G (1991) Evidence-based medicine. ACP J Club (Ann Intern Med) 114(suppl 2):1–16
Guyatt G et al (2008) Users’ guides to the medical literature: a manual for evidence-based clinical practice, preface page, 2nd edn. McGraw-Hill, New York. ISBN 978-0-07-159036-5; MHID 0-07-159036-6
http://www.gradeworkinggroup.org Accessed 30 July 2009