1 Julius Center for Health Sciences and Primary Care, Department of Epidemiology, University Medical Center Utrecht, PO Box 85500, 3508 GA Utrecht, The Netherlands.
2 Eli Lilly and Company Limited, Erl Wood Manor, Sunninghill Road, Windlesham, GU20 6PH, UK.
3 Julius Center for Health Sciences and Primary Care, Department of Epidemiology, University Medical Center Utrecht, PO Box 85500, 3508 GA Utrecht, The Netherlands. Electronic address: [email protected].