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Competing interests: all the authors gave evidence to the Court of Appeal following requests by the Crown Prosecution Service to review the four cases from their individual specialist perspectives
All the authors studied all cases involved in the appeals and wrote reports which were presented to the Court. The majority heard all the evidence presented and all have studied the judgement. The corresponding author wrote the basic manuscript which was re-drafted several times following comments and suggestions from the listed authors. All authors have read the final manuscript and agree with its contents.