[1] Isala, Ctr Diabet, POB 10400, NL-8000 GK Zwolle, Netherlands
[2] Isala Women & Childrens Hosp, Zwolle, Netherlands
[3] Langerhans Med Res Grp, Ommen, Netherlands
[4] Univ Groningen, Dept Gen Practice, Groningen, Netherlands
[5] Univ Med Ctr Groningen, Groningen, Netherlands
[6] Univ Groningen, Dept Internal Med, Groningen, Netherlands
[7] Univ Groningen, UMCG Postgrad Sch Med, Groningen, Netherlands