1. Uppsala University , Department for Surgical Sciences , Uppsala , Sweden
2. Department of Anaesthesia , Tampere University Hospital , Tampere , Finland
3. Karolinska Instutet , CLINTEC , Stockholm , Sweden
4. Department of Pharmaceutical Biosciences , Division of Biological Research on Drug Dependence, Uppsala University , Uppsala , Sweden
5. Department of Surgical and Perioperative Sciences , Umeå University , Umeå , Sweden
6. Pain Centre , Uppsala University Hospital , Uppsala , Sweden
7. Division of IVD System Development , Precision System Science Co., Ltd , Chiba , Japan