<div class="row">
<div class="col-md-4 col-sm-12"></div>
<div class="col-md-4 col-sm-12"></div>
<div class="col-md-4 col-sm-12"></div>
<div class="clearfix visible-md"></div>
<div class="col-md-4 col-sm-12"></div>
<div class="col-md-4 col-sm-12"></div>
<div class="col-md-4 col-sm-12"></div>
</div>