docs: private CodeableConcept makeUnits(String text, String ucum) {
  		if (Utilities.noString(text) && Utilities.noString(ucum))
  			return null;
  		CodeableConcept cc = new CodeableConcept();
  		cc.setText(text);
  		cc.getCoding().add(new Coding().setCode(ucum).setSystem("http://unitsofmeasure.org"));
  		return cc;
  	}