Generated Narrative: CodeSystem MDREX This case-sensitive code system http://terminology.hl7.org/CodeSystem/MDREX defines codes, but no codes are represented here
MedDRA MSSO/ Northrop Grumman,MedDRA MSSO/ Northrop Grumman
Medical Dictionary for Regulatory Activities Terminology (MedDRA), with expanded abbreviations, Version 7.0. Bethesda, MD: National Library of Medicine, March 1, 2004.