Dr. Ronan Glynn:

They are not completely blinded in the RCOG review. As Dr. McKenna has said, they are aware that every case at which they are looking is a case of someone who went on to develop cervical cancer so that will lead to what we call hindsight bias, which is why we are constantly at pains to emphasis that this is a feature of this review. Again, this is why it will be so important that the results are placed in that context. Given the fact that the reviewers know what subsequently happened to the participants in the review, their review of the slides will, obviously, be influenced by that. That is a common feature of many reviews. The key element of that is that it is acknowledged and factored into the analysis of the results that emanate from the review.