Authors: Richard W Laing; Hynek Mergental; Christina Yap; Amanda Kirkham; Manpreet Whilku; Darren Barton; Stuart Curbishley; Yuri L Boteon; Desley A Neil; Stefan G Hübscher; M Thamara P R Perera; Paolo Muiesan; John Isaac; Keith J Roberts; Hentie Cilliers; Simon C Afford; Darius F Mirza Journal: BMJ Open Date: 2017-11-28 Impact factor: 2.692