Authors: Sumantra Ray; Ruzan Udumyan; Minha Rajput-Ray; Ben Thompson; Keri-Michele Lodge; Pauline Douglas; Poonam Sharma; Rachel Broughton; Sandra Smart; Rick Wilson; Stephen Gillam; Mike J van der Es; Ilana Fisher; Joan Gandy Journal: BMJ Open Date: 2012-02-10 Impact factor: 2.692