public function getBrowserEngines($idSite, $period, $date, $segment = false)
{
$dataTable = $this->getDataTable('DevicesDetection_browserEngines', $idSite, $period, $date, $segment);
$dataTable->filter('AddSegmentValue');
// use GroupBy filter to avoid duplicate rows if old (UserSettings) and new (DevicesDetection) reports were combined
$dataTable->filter('GroupBy', array('label', __NAMESPACE__ . '\\getBrowserEngineName'));
return $dataTable;
}