```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns3:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/">
    <query_name>Patient Instruc@11:32:12</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>1</hlevel>
            <item_name>Medications</item_name>
            <item_key>\\i2b2_MEDS\i2b2\Medications\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Medications</tooltip>
            <class>ENC</class>
            <constrain_by_modifier>
                <modifier_name>Patient Instructions</modifier_name>
                <modifier_key>\\i2b2_MEDS\Medication\Instructions\</modifier_key>
                <applied_path>\i2b2\Medications\%</applied_path>
            </constrain_by_modifier>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>5</hlevel>
            <item_name>IMMUNOGLOBULIN E (LOINC:19113-0)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB32) Immunology\(LLB40) Immunoglobulin\IGE\LOINC:19113-0\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Labtests \ Immunology \ Immunoglobulin \ IgE (Group:IGE) \ IMMUNOGLOBULIN E (LOINC:19113-0)</tooltip>
            <class>ENC</class>
            <constrain_by_value>
                <value_operator>EQ</value_operator>
                <value_constraint>29</value_constraint>
                <value_unit_of_measure>iu/ml</value_unit_of_measure>
                <value_type>NUMBER</value_type>
            </constrain_by_value>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns3:query_definition>

```

I want to find all instances of medications where the patient instruction is "Patient Instructions" and the lab test result for Immunoglobulin E (LOINC:1913-0) is equal to 29 IU/mL.