Existing Wording: whoReference (Practitioner | RelatedPerson | Patient)

Comment:

Role of person signing is limited to only three types. But often multiple practitioners with different roles may have to sign (e.g. Lab technician and doctor reviewing the lab report). It may be difficult to differentiate between the two with both of signing as "Practictioner". It is likely that the Signature data type may be included in another resource (e.g. lab report) that can indicate the role of the person signing.