[1] NU Hosp Grp, Dept Med, Uddevalla, Sweden
[2] Varnamo Hosp, Varnamo, Sweden
[3] Univ Gothenburg, Dept Mol & Clin Med, Gothenburg, Sweden
[4] Lund Univ, Dept Clin Sci Lund, Lund, Sweden
[5] Skane Univ Hosp, Dept Endocrinol, Scania, Sweden
[6] Karolinska Univ Hosp, Dept Clin Chem, Stockholm, Sweden
[7] Univ Washington, Div Metab Endocrinol & Nutr, Seattle, WA 98195 USA
[8] Natl Inst Hlth & Welf, Dept Chron Dis Prevent, Helsinki, Finland
[9] King Abdulaziz Univ, Diabet Res Grp, Jeddah, Saudi Arabia
[10] Dasman Diabet Inst, Res Div, Dasman, Kuwait
[11] Stat Konsultgruppen, Gothenburg, Sweden
[12] Chalmers Univ Technol, Dept Mat Sci, Gothenburg, Sweden
[13] Univ Gothenburg, Gothenburg, Sweden