```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>Acute-HEMOG- Visi@10:22:25</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>2</hlevel>
            <item_name>Acute upper respiratory infections (j00-j06)</item_name>
            <item_key>\\ICD10_ICD9\Diagnoses\(J00-J99) Dise~45pn\(J00-J06) Acut~bb2r\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Diseases of the respiratory system (j00-j99) \ Acute upper respiratory infections (j00-j06)</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>2</hlevel>
            <item_name>Influenza and pneumonia (j09-j18)</item_name>
            <item_key>\\ICD10_ICD9\Diagnoses\(J00-J99) Dise~45pn\(J09-J18) Infl~7z2l\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Diseases of the respiratory system (j00-j99) \ Influenza and pneumonia (j09-j18)</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>2</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>1</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>5</hlevel>
            <item_name>HEMOGLOBIN (LOINC:718-7)</item_name>
            <item_key>\\i2b2_LABS\i2b2\Labtests\LAB\(LLB53) Hematology\(LLB57) Complete Blood Count\HGB\LOINC:718-7\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Labtests \ Hematology \ Complete Blood Count \ HGB (Group:HGB) \ Vhgb (LOINC:718-7)</tooltip>
            <class>ENC</class>
            <constrain_by_value>
                <value_operator>LT</value_operator>
                <value_constraint>12</value_constraint>
                <value_unit_of_measure>g/dl</value_unit_of_measure>
                <value_type>NUMBER</value_type>
            </constrain_by_value>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
    <panel>
        <panel_number>3</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>3</hlevel>
            <item_name> Visit at age 9 or less</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\0-9 years old\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 0-9 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 10 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\10-17 years old\10 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 10-17 years old \ 10 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 11 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\10-17 years old\11 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 10-17 years old \ 11 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 12 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\10-17 years old\12 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 10-17 years old \ 12 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 13 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\10-17 years old\13 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 10-17 years old \ 13 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 14 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\10-17 years old\14 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 10-17 years old \ 14 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Visit at age 15 years old</item_name>
            <item_key>\\i2b2_VISIT\i2b2\Visit Details\Age at visit\10-17 years old\15 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Visit Details \ Age at visit \ 10-17 years old \ 15 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find patients who have a diagnosis of Influenza and Pneumonia (J09-J18) with Hemoglobin (HGB) level less than 12 g/dl at the age of 9 years or younger.