<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>Experiment</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="selectbasic">Pain Model</label>
<div class="col-md-4">
<select id="selectbasic" name="selectbasic" class="form-control">
<option value="1">Option one</option>
<option value="2">Option two</option>
</select>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="selectbasic">Pain-related behavior</label>
<div class="col-md-4">
<select id="selectbasic" name="selectbasic" class="form-control">
<option value="1">Option one</option>
<option value="2">Option two</option>
</select>
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="selectbasic">Treatment</label>
<div class="col-md-4">