Publication Build: This will be filled in by the publication tooling
<observation classCode="OBS" moodCode="EVN">
<templateId root="2.16.840.1.113883.10.20.22.4.31" />
<!-- Age observation -->
<code code="445518008"
codeSystem="2.16.840.1.113883.6.96"
displayName="Age At Onset" />
<statusCode code="completed" />
<value xsi:type="PQ" value="57" unit="a" />
</observation>