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PDQ Cancer Information Summaries [Internet].
Bethesda (MD): National Cancer Institute (US); 2002-.
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WHO Guidelines for Safe Surgery 2009: Safe Surgery Saves Lives.
Geneva: World Health Organization; 2009.
Chronic Obstructive Pulmonary Disease.
Chick DA, Grant PJ, Van Harrison R, et al.
Ann Arbor (MI): Michigan Medicine University of Michigan; 2020 Jul.
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