Case Based Surveillance Implementation Guide
            
            0.2.1 - ci-build
            
          
Case Based Surveillance Implementation Guide - Local Development build (v0.2.1). See the Directory of published versions
| Active as of 2021-01-01 | 
Definitions for the cbs-illness-duration extension.
| 1. Extension | |
| Definition | Illness duration to obscure PHII in place of absolute dates.  | 
| Control | 0..* This element is affected by the following invariants: ele-1 | 
| Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())  | 
| 2. Extension.id | |
| Definition | Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.  | 
| Control | 0..1 | 
| Type | string | 
| 3. Extension.extension | |
| Definition | An Extension  | 
| Control | 0..0 | 
| Type | Extension | 
| Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count())) ext-1: Must have either extensions or value[x], not both (: extension.exists() != value.exists())  | 
| Slicing | This element introduces a set of slices on Extension.extension. The slices are unordered and Open, and can be differentiated using the following discriminators: 
  | 
| 4. Extension.url | |
| Definition | Source of the definition for the extension code - a logical name or a URL.  | 
| Control | 1..1 | 
| Type | uri | 
| Comments | The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension.  | 
| Fixed Value | http://cbsig.chai.gatech.edu/StructureDefinition/cbs-illness-duration | 
| 5. Extension.value[x] | |
| Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).  | 
| Control | 0..1 | 
| Type | Quantity | 
| [x] Note | See Choice of Data Types for further information about how to use [x] | 
| Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))  | 
| Slicing | This element introduces a set of slices on Extension.value[x]. The slices are unordered and Closed, and can be differentiated using the following discriminators: 
  | 
| 6. Extension.value[x]:valueQuantity | |
| SliceName | valueQuantity | 
| Definition | Value of extension - must be one of a constrained set of the data types (see Extensibility for a list).  | 
| Control | 0..1 | 
| Type | Quantity | 
| [x] Note | See Choice of Data Types for further information about how to use [x] | 
| Must Support | true | 
| Invariants | Defined on this element ele-1: All FHIR elements must have a @value or children (: hasValue() or (children().count() > id.count()))  |