[1] Univ Leicester, Leicester Gen Hosp, Diabet Res Ctr, Gwendolen Rd, Leicester LE5 4WP, England
[2] Univ Eastern Finland, Inst Publ Hlth & Clin Nutr, Yliopistonranta 1C, Canthia Bldg, B wing, FI-70211 Kuopio, Finland
[3] Univ Eastern Finland, Kuopio Univ Hosp, Inst Clin Med, Dept Med, Yliopistonranta 1 C, Canth Bldg, B wing, FI-70029 Kuopio, Finland
[4] Cent Finland Hlth Care Dist, Dept Med, Jyvaskyla 40620, Finland