1. Effective Evidence LLP; 7 Bournemouth Road Eastleigh Hampshire UK SO53 3DA
2. Warwick Medical School, University of Warwick; Division of Health Sciences; Coventry UK CV4 7AL
3. Teesside University; Health and Social Care Institute; Middlesbrough UK TS1 3BA
4. Institute of General Practice, Medical Faculty of the Heinrich-Heine-University Düsseldorf; Cochrane Metabolic and Endocrine Disorders Group; Moorenstr. 5 Düsseldorf Germany 40225