```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>  18-34 years o@16:55:31</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>3</hlevel>
            <item_name>  18-34 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\18-34 years old\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Demographics \ Age \ 18-34 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>3</hlevel>
            <item_name>  35-44 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\35-44 years old\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Demographics \ Age \ 35-44 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>3</hlevel>
            <item_name>  45-54 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\45-54 years old\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Demographics \ Age \ 45-54 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>55 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\55-64 years old\55 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographics \ Age \ 55-64 years old \ 55 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>56 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\55-64 years old\56 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographics \ Age \ 55-64 years old \ 56 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>57 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\55-64 years old\57 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographics \ Age \ 55-64 years old \ 57 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>58 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\55-64 years old\58 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographics \ Age \ 55-64 years old \ 58 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>59 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\55-64 years old\59 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographics \ Age \ 55-64 years old \ 59 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>60 years old</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Age\55-64 years old\60 years old\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographics \ Age \ 55-64 years old \ 60 years old</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>4</hlevel>
            <item_name>Acute pancreatitis, unspecified</item_name>
            <item_key>\\ICD10_ICD9\Diagnoses\(K00-K94) Dise~rl1r\(K80-K87) Diso~5bj3\(K85) Acute pa~es5c\(K85.9) Acute~8qj1\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Diseases of the digestive system (k00-k94) \ Disorders of gallbladder, biliary tract and pancreas (k80-k87) \ Acute pancreatitis
 \ Acute pancreatitis, unspecified</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
        <item>
            <hlevel>3</hlevel>
            <item_name>Living</item_name>
            <item_key>\\i2b2_DEMO\i2b2\Demographics\Vital Status\Living\</item_key>
            <item_icon>LA</item_icon>
            <tooltip>Demographic \ Vital Status \ Living</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find all encounters where the patient's age is between 18 and 64 years old, and they have been diagnosed with acute pancreatitis, unspecified, and their vital status is living.