public function getTopBrowsersForPeriod($startDate, $endDate, $maxResults)
    {
        $browserData = [];
        $answer = $this->performQuery($startDate, $endDate, 'ga:sessions', ['dimensions' => 'ga:browser', 'sort' => '-ga:sessions']);

        if (is_null($answer->rows)) {
            return new Collection([]);
        }

        foreach ($answer->rows as $browserRow) {
            $browserData[] = ['browser' => $browserRow[0], 'sessions' => $browserRow[1]];
        }

        $browserCollection = new Collection(array_slice($browserData, 0, $maxResults - 1));

        if (count($browserData) > $maxResults) {
            $otherBrowsers = new Collection(array_slice($browserData, $maxResults - 1));
            $otherBrowsersCount = array_sum($otherBrowsers->lists('sessions'));

            $browserCollection->put(null, ['browser' => 'other', 'sessions' => $otherBrowsersCount]);
        }

        return $browserCollection;
    }