Download the FREE app and view selected topics (Approximately 10% of the content is viewable in the free app and tapping on the locked topic will launch the in-app purchase screen). ABOUT: MobileDDx™ - Pocket Differential Diagnosis Based on the McGraw Hill Diagnosaurus 4.0 with Over 1,000+ medicine & surgery differential diagnoses. Sign & Symptom index. Disease Index. Author: Roni F. Zeiger, MD (Medicine), Gerard M. Doherty, MD (Surgery) Publisher: McGraw-Hill SPECIAL FEATURES: Locate a disea