1. Oregon Health Sciences University; Department of Medical Informatics and Clinical Epidemiology; 3181 SW Sam Jackson Park Road Mail Stop B1CC Portland Oregon USA 97239
2. Center for Disease Control and Prevention; Division of Diabetes Translation; 4770 Buford Highway Mail Stop K-10, Davidson Building Atlanta Georgia USA 30341
3. University of Aberdeen; Health Services Research Unit; Foresterhill Aberdeen UK AB25 2ZD
4. Tufts University School of Medicine; 750 Washington Ave Boston Massachusetts USA MA 02111
5. Tufts Medical Centre; New England Medical Centre/Tufts Evidence-based Practice Center Institute for Clinical Research and Health Policy Studies; 800 Washington Street Box 63 Boston MA USA 02111