- Blood samples will be taken, by a nurse at the health center, to analyze the potential correlation of the following hormones/cytokines with symptoms and function data: S-IGF-I, S-BDNF, S-VEGF and high sensitivity CRP. The blood samples are stored in a separate, locked -70 freezer at c-lab Sahlgrenska. IVO has been notified of the establishment of a biobank (No 946).