1. Centre for Health Economics and Medicines Evaluation Bangor University Bangor United Kingdom
2. MRC Biostatistics Unit, School of Clinical Medicine University of Cambridge Cambridge United Kingdom
3. Department of Pathology University of Cambridge Cambridge United Kingdom
4. MRC Human Nutrition Research Cambridge United Kingdom
5. Centre for Academic Primary Care, Population Health Sciences, Bristol Medical School University of Bristol Bristol United Kingdom
6. Biomineral Research Group, Department of Veterinary Medicine University of Cambridge Cambridge United Kingdom