public function attributeLabels()
{
return array('firm_id' => 'Firm', 'theatre_id' => 'Theatre', 'start_date' => 'Start date', 'end_date' => 'End date', 'start_time' => 'Start time', 'end_time' => 'End time', 'interval_id' => 'Interval', 'general_anaesthetic' => 'General anaesthetic', 'default_admission_time' => 'Default admission time');
}