protected function buildFilterCriteria($filter = array())
{
$criteria = new \CDbCriteria();
$this->handleDateRangeFilter($criteria, $filter);
$this->handleSubspecialtyListFilter($criteria, $filter);
$this->handleSiteListFilter($criteria, $filter);
$this->handleConsultantListFilter($criteria, $filter);
$this->handleIssuedFilter($criteria, $filter);
return $criteria;
}