related articles shortcode kleo

add_shortcode('kleo_related_articles', 'kleo_related_articles_func');

function kleo_related_articles_func( $atts, $content = null ) {

    $output = '';
    //extract(shortcode_atts(array(), $atts));

    ob_start();

    get_template_part('page-parts/posts-related');

    $output = ob_get_clean();

    return $output;
}