Authors: Chris Salisbury; Clare Thomas; Alicia O'Cathain; Anne Rogers; Catherine Pope; Lucy Yardley; Sandra Hollinghurst; Tom Fahey; Glyn Lewis; Shirley Large; Louisa Edwards; Alison Rowsell; Julia Segar; Simon Brownsell; Alan A Montgomery Journal: BMJ Open Date: 2015-02-06 Impact factor: 2.692