Authors: Alison Cooper; Freya Davies; Michelle Edwards; Pippa Anderson; Andrew Carson-Stevens; Matthew W Cooke; Liam Donaldson; Jeremy Dale; Bridie Angela Evans; Peter D Hibbert; Thomas C Hughes; Alison Porter; Tim Rainer; Aloysius Siriwardena; Helen Snooks; Adrian Edwards Journal: BMJ Open Date: 2019-04-11 Impact factor: 2.692