[1] UNIV HELSINKI, DEPT CLIN CHEM, SF-00290 HELSINKI 29, FINLAND
[2] UNIV HELSINKI, ENDOCRINE RES UNIT, SF-00290 HELSINKI 29, FINLAND
[3] MINERVA FDN INST, HELSINKI, FINLAND
[4] PITAJANMAKI EPILEPSY CTR, HELSINKI, FINLAND
[5] MEDIX LABS LTD, HELSINKI, FINLAND
[6] HESPERIA HOSP, HELSINKI, FINLAND