Thanks for your comment – and we're glad you agree with us that, from this study, no conclusion can be reached about cause and effect.
Thanks for linking to the BMJ responses, too: they're very interesting!
For those of you reading this in our forum, here's the link to the original article...
May I suggest that anyone who is worried look at the responses to this study in the BMJ? The headlines in the tabloids yesterday did nothing other than to cause distress to women, particularly those who have suffered the death of their babies, and you are absolutely right that correlation does not mean causation. http://www.bmj.com/content/351/bmj.h5774/rapid-responses