Thank you. All the other links mentioned (including the OP) are news pieces about this NEJM article, which is itself a cracking good read, very accessible. For

Thank you. All the other links mentioned (including the OP) are news pieces about this NEJM article, which is itself a cracking good read, very accessible. For completeness of links: here's the NEJM article page: http://www.nejm.org/doi/full/10.1056/NEJMms1411398 http://www.nejm.org/doi/full/10.1056/NEJMms1411398