1. Institute of Social and Preventive Medicine (ISPM), University of Bern , 3012 Bern , Switzerland
2. Graduate School for Health Sciences, University of Bern , 3012 Bern , Switzerland
3. Swiss Paraplegic Research , 6207, Nottwil , Switzerland
4. School of Nursing and Midwifery, National University of Ireland , Galway H91 CF50 , Ireland
5. HRB-Trials Methodology Research Network, National University Of Ireland , Galway H91 CF50 , Ireland
6. Department of Obstetrics and Gynaecology, McGill University Health Center, McGill University , Montreal H4A 3J1 , Canada
7. Public Health & Primary Care Library, University Library of Bern, University of Bern , 3012 Bern, Switzerland
8. Department of Epidemiology, Erasmus MC, University Medical Center , 3000 CA Rotterdam , the Netherlands
9. Division of Human Nutrition and Health, Wageningen University & Research , 6708 PB Wageningen , the Netherlands
10. Department of Medicine, Internal Medicine, Lausanne University Hospital (CHUV) and University of Lausanne , Lausanne CH-1015 , Switzerland
11. Section on Nutrition and Nutritional Epidemiology, Department of Internal Medicine, Rush University , Chicago, IL 60612 , USA