1 Diabetes Center for Pediatric and Adolescent Diabetes Care and Research, Rotterdam 3011TA, Netherlands.
2 Diabetes Center for Pediatric and Adolescent Diabetes Care and Research, Rotterdam 3011TA, Netherlands; University Medical Centre Groningen, Department of Genetics, Groningen, Netherlands.
3 Diabetes Center for Pediatric and Adolescent Diabetes Care and Research, Rotterdam 3011TA, Netherlands. Electronic address: d.mul@diabeter.nl.