public static function findExpiredSubscriptions(array $arrOptions=array())
	{
		$t = static::$strTable;
		$objDatabase = Database::getInstance();

		$objResult = $objDatabase->prepare("SELECT * FROM $t WHERE active='' AND EXISTS (SELECT * FROM tl_opt_in_related r LEFT JOIN tl_opt_in o ON r.pid=o.id WHERE r.relTable='$t' AND r.relId=$t.id AND o.createdOn<=? AND o.confirmedOn=0)")
								 ->execute(strtotime('-24 hours'));

		if ($objResult->numRows < 1)
		{
			return null;
		}

		return static::createCollectionFromDbResult($objResult, $t);
	}