1 Department of Endocrinology, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg and Sahlgrenska University Hospital, Gröna Stråket 8, SE-413 45, Gothenburg, Sweden.
2 Department of Endocrinology, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg and Sahlgrenska University Hospital, Gröna Stråket 8, SE-413 45, Gothenburg, Sweden. bengt-ake.bengtsson@medic.gu.se.