Johan Ejerhed1, Helena Nordenstedt2, Ann-Charlotte Laska3. 1. Danderyd Hospital, Division of Internal Medicine, 182 88 Stockholm, Sweden. Electronic address: johan.herlin-ejerhed@ds.se. 2. Danderyd Hospital, Division of Internal Medicine, 182 88 Stockholm, Sweden; Department of Public Health Sciences, Karolinska Institutet, Stockholm, Sweden. 3. Danderyd Hospital, Division of Internal Medicine, 182 88 Stockholm, Sweden.