The article by Coleman ^{Reference Coleman1} published in our September issue has provoked a great deal of debate and correspondence. We are aware of the controversy of the subject matter and were planning a commentary on this subject before the article was published. As the volume of material now goes far beyond the bounds of a commentary, we now intend to bring all the relevant correspondence and papers together in a forthcoming issue so that we give adequate and comprehensive coverage of an important topic, while at the same time trying to be as dispassionate and balanced as possible in ensuring that all relevant voices are heard. We aim to publish this as soon as possible.