description: |-
  The medical practitioner (could be a doctor, an assistant, a chronic care specialist working at the GP, etc) who is responsible for entering this
  information. Can be an assistant simply entering data from external sources; necessarily refers to somebody who works for the GP that is the source
  of this medical dossier.
  
  The format of this string depends on the source. It's sometimes a short 'memo code', sometimes an ID (such as a BIC registry number or AGB code),
  sometimes a full name.
  
  OPEN QUESTION: Would it be useful if this field is more structured and e.g. explains what it is, or that this field contains an ID that can be
  separately looked up using another API endpoint; we are very dependent on the source for the nature of this information, but some e.g. provide
  the doctor under whose authority a practitioner is operating, which could be useful information. We can't guarantee that we can provide this data
  in a specific structure due to fundamental differences between GPIS vendors, hence why right now this field is free-form.
type: string
example: AA