[1] CHU Vaudois, Endocrinol Diabet & Metab Serv, CH-1011 Lausanne, Switzerland
[2] Univ Helsinki, Inst Biomed Physiol, Helsinki, Finland
[3] Helsinki Univ Cent Hosp, Childrens Hosp, Helsinki, Finland
[4] Univ Lausanne, Fac Biol & Med, CHU Vaudois, Inst Physiol & Endocrinol,Diabet & Metab Serv, CH-1011 Lausanne, Switzerland