ia-haspopup="true">Articles</button>
  <ul class="dropdown-menu" aria-labelledby="dropdown-articles"><li><a class="dropdown-item" href="../articles/intro.html">Introduction</a></li>
    <li><a class="dropdown-item" href="../articles/structures.html">Creation of model structures</a></li>
    <li><a class="dropdown-item" href="../articles/outcomes.html">Creation of model outcomes</a></li>
    <li><a class="dropdown-item" href="../articles/fitting.html">Fitting and analysing models</a></li>
    <li><a class="d