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(4) Centers for Disease Control and Prevention. Public Domain.
(5) http://en.wikipedia.org/wiki/Image:CulexNil.jpg. Public Domain.
(6) http://www.nchealthandhealing.com/elements/media/topic-media/4_6_
cigarette_warning_label.jpg. no copyright information given at Web site.
(7) http://en.wikipedia.org/wiki/File:Illu_lymphatic_system.jpg. Public
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