Authors: Rebecca Randell; Natasha Alvarado; Lynn McVey; Joanne Greenhalgh; Robert M West; Amanda Farrin; Chris Gale; Roger Parslow; Justin Keen; Mai Elshehaly; Roy A Ruddle; Julia Lake; Mamas Mamas; Richard Feltbower; Dawn Dowding Journal: BMJ Open Date: 2020-02-25 Impact factor: 2.692