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Professional
Consumer
Merck Manual
Professional Version
MEDICAL TOPICS
RESOURCES
DRUG INFO
COMMENTARY
PROCEDURES
QUIZZES
ABOUT US
MEDICAL TOPICS
RESOURCES
Professional
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About the Merck Manuals
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Authors
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anthony villano
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Anthony Villano, MD
Affiliations
Instructor
Fox Chase Cancer Center
Manual Chapters and Commentaries
Chapters
Tumors of the Gastrointestinal Tract