<xs:simpleType name="IntubationApproachCodeType" >
  <xs:restriction base="xs:string">
    <xs:enumeration value="Endoctracheal"/>
    <xs:enumeration value="Nasogastric"/>
    <xs:enumeration value="Nasotracheal"/>
    <xs:enumeration value="Fiberoptic"/>
    <xs:enumeration value="Tracheostomy"/>
    <xs:enumeration value="Speaking tracheostomy"/>
    <xs:enumeration value="Other"/>
    <xs:enumeration value="Unknown"/>
  </xs:restriction>
</xs:simpleType>