public function getPrintArea($index = 0)
    {
        if ($index == 0) {
            return $this->printArea;
        }
        $printAreas = explode(',', $this->printArea);
        if (isset($printAreas[$index - 1])) {
            return $printAreas[$index - 1];
        }

        throw new PhpSpreadsheetException('Requested Print Area does not exist');
    }