Generated Narrative: NamingSystem W1-W2 Summary Defining URL http://terminology.hl7.org/NamingSystem/W1-W2 Version 2.1.0 Name W1W2 Title WHO rec# drug codes Status retired Definition WHO rec# drug codes Identifiers Type Value Preferred OID 2.16.840.1.113883.6.71 true URI http://terminology.hl7.org/CodeSystem/W1-W2 true