[1] Peninsula Med Sch, Inst Biomed & Clin Sci, Exeter EX2 5AX, Devon, England
[2] Charles Univ, Dept Paediat, Fac Med 3, Prague, Czech Republic
[3] Univ Nijmegen, Med Ctr, Div Gen Internal Med, Nijmegen, Netherlands
[4] Gentofte, Steno Diabet Ctr, Copenhagen, Denmark
[5] Gentofte, Hagedorn Res Inst, Copenhagen, Denmark
[6] St Thomas Hosp, Dept Chem Pathol, London, England
[7] Univ HOsp Birmingham, Reg Endocrine Labs, Birmingham, W Midlands, England