Authors: M J Davies; S Heller; T C Skinner; M J Campbell; M E Carey; S Cradock; H M Dallosso; H Daly; Y Doherty; S Eaton; C Fox; L Oliver; K Rantell; G Rayman; K Khunti Journal: BMJ Date: 2008-02-14
Authors: Jinhui Ma; Lehana Thabane; Janusz Kaczorowski; Larry Chambers; Lisa Dolovich; Tina Karwalajtys; Cheryl Levitt Journal: BMC Med Res Methodol Date: 2009-06-16 Impact factor: 4.615