public function getSurgeons()
{
if (!$this->surgeonlist) {
$criteria = new CDbCriteria();
$criteria->compare('active', true);
$criteria->compare('is_doctor', 1);
$criteria->order = 'first_name,last_name asc';
$this->surgeonlist = User::model()->findAll($criteria);
}
return $this->surgeonlist;
}