Also, as a very quick check, I think I would do something like
```
var footer = doc.getElementById('footer');
if(!footer) return;
var elsevierLink = footer.getElementsByTagName('a')[0];
if(!elsevierLink || elsevierLink.textContent.trim() != 'Elsevier') return;
```
This should make it fairly stringent, but from my random sampling of journals I think all of them pass. We should still do the multiples check below though.