public function commonDrugsBySiteAndSpec($site_id, $subspecialty_id)
{
$params = array(':subSpecialtyId' => $subspecialty_id, ':siteId' => $site_id);
return SiteSubspecialtyDrug::model()->with('drugs')->findAll(array('condition' => 't.subspecialty_id = :subSpecialtyId AND t.site_id = :siteId', 'order' => 'name', 'params' => $params));
}