1. Warwick Medical School, University of Warwick; Division of Health Sciences; Coventry UK CV4 7AL
2. Effective Evidence LLP; 26 The Curve Waterlooville Hampshire UK PO8 9SE
3. Teesside University; Health and Social Care Institute; Middlesbrough UK TS1 3BA
4. Durham University Queen's Campus; School of Medicine, Pharmacy and Health; Durham UK TS17 6BH
5. Institute of General Practice, Medical Faculty of the Heinrich-Heine-University Düsseldorf; Cochrane Metabolic and Endocrine Disorders Group; Moorenstr. 5 Düsseldorf Germany 40225