Prehospital optimal shock energy for defibrillation (POSED): A cluster randomised controlled feasibility trial oleh Helen Pocock, Charles D Deakin, Ranjit Lall, Felix Michelet, Chu Sun, Deb Smith, Catherine Hill, Jeskaran Rai, Kath Starr, Martina Brown, Isabel Rodriguez-Bachiller, Gavin D. Perkins