function dozent_get_review( $review_id = 0 ) {
		global $wpdb;

		if ( ! $review_id ) {
			return false;
		}

		$query = $wpdb->get_row( " 
			SELECT reviews.* ,
			review_author.display_name as user_display_name,
			course.post_title as course_title
			
			FROM {$wpdb->dozent_reviews} reviews 
			LEFT JOIN {$wpdb->users} review_author ON reviews.user_id = review_author.ID
			LEFT JOIN {$wpdb->posts} course ON reviews.course_id = course.ID
		 
			WHERE reviews.ID = {$review_id} ;" );

		/**
		 * Filter review result
		 *
		 * @param  object|null  $query  Reivew query result
		 * @param  int  $review_id
		 */

		return apply_filters( 'dozent_get_review', $query, $review_id );
	}