The followings are the available columns in table:
Inheritance: extends BaseEventTypeElement
 /**
  * Gets latest booking diagnosis from completed operation booking or defaults to episode diagnosis.
  *
  * @return string
  */
 public function getLatestCompletedOperationBookingDiagnosis($patient)
 {
     $completed = OphTrOperationbooking_Operation_Status::model()->find('name=?', array('Completed'));
     $criteria = new CDbCriteria();
     $criteria->addCondition('episode.patient_id = :patient_id');
     $criteria->params[':patient_id'] = $patient->id;
     $criteria->order = 'event.created_date desc';
     $criteria->addCondition('t.status_id = :status_id');
     $criteria->params[':status_id'] = $completed->id;
     if ($operation = Element_OphTrOperationbooking_Operation::model()->with(array('event' => array('with' => 'episode')))->find($criteria)) {
         return Element_OphTrOperationbooking_Diagnosis::model()->find('event_id=?', array($operation->event_id))->disorder->term;
     }
     return $patient->epd;
 }
 public function getDisorderText()
 {
     if (!($diagnosis = Element_OphTrOperationbooking_Diagnosis::model()->find('event_id=?', array($this->event_id)))) {
         throw new Exception("Unable to find diagnosis element for event_id {$this->event_id}");
     }
     return $diagnosis->disorder->term;
 }