function dozent_get_total_quiz( $course_ID = 0 ) {
		$course_ID = dozent_get_post_id( $course_ID );

		$total_quiz = (int) get_post_meta( $course_ID, '_total_quiz', true );

		return apply_filters( 'dozent_get_total_quiz', $total_quiz, $course_ID );
	}