1 Diabetes Research Centre, University of Leicester, Leicester General Hospital, Leicester, UK; Institute of Clinical Medicine, Department of Medicine, University of Eastern Finland, Kuopio, Finland. Electronic address: skk31@cantab.net.
2 Institute of Clinical Medicine, Department of Medicine, University of Eastern Finland, Kuopio, Finland; Wellbeing Services County of Central Finland, Department of Medicine, Jyväskylä, Jyväskylä, Finland.