Rajagopal, Sangeerthana, Booth, Scott J., Brown, Terry P., Ji, Chen, Hawkes, Claire, Siriwardena, A. Niroshan, Kirby, Kim, Black, Sarah, Spaight, Robert, Gunson, Imogen, Brace-Mcdonnell, Samantha J., Perkins, Gavin D., "Data quality and 30-day survival for out-of-hospital cardiac arrest in the UK out-of-hospital cardiac arrest registry: A data linkage study", BMJ Open, 2017