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GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often, US$ 23.16 Min. order: 1 piece ★★★★★ 4.7 (165 reviews) Sold : Login>>
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Differentiating between early melanomas and melanocytic nevi: A state-of-the-art review US$ 20.76 Min. order: 1 piece ★★★★★ 5.0 (197 reviews) Sold : Login>>