Professor Sabaratnam Arulkumaran:

That is correct. As an example, if a woman has an underlying renal disorder which was not picked up before the pregnancy started and develops a condition - during pregnancy conditions such as pre-eclampsia, diabetes and hypertension can develop - her condition will deteriorate rapidly. If we had proceeded according to stratification, we would have missed that lady. That is why it is sometimes not that easy. Even if we had a list, it could not cover the entire spectrum.