{{ form_start(form) }}
    <div class="input-group input-group-sm">
            
        <div class="input-group-prepend">
            <span  class="btn btn-primary">{% trans %}basics.treatment{% endtrans %}</span>
        </div>

        {{ form_widget(form.yearselect) }}
        
    </div>
{{ form_end(form) }}