Authors: Gokulan Ratnarajan; Wendy Newsom; Stephen A Vernon; Cecilia Fenerty; David Henson; Fiona Spencer; Yanfang Wang; Robert Harper; Andrew McNaught; Lisa Collins; Mike Parker; John Lawrenson; Robyn Hudson; Peng Tee Khaw; Richard Wormald; David Garway-Heath; Rupert Bourne Journal: BMJ Open Date: 2013-07-21 Impact factor: 2.692