Biomarkers for painSee related article by Eisenach et al., pages 207–212 of this issue

aPain Clinic, Department of Anaesthesia and Intensive Care Medicine, Helsinki University Central Hospital, P.O. Box 340, 00029 Helsinki, Finland bMGH Pain Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA ∗Address: Pain Clinic, Department of Anaesthesia and Intensive Care Medicine, Helsinki University Central Hospital, P.O. Box 340, 00029 Helsinki, Finland. Tel.: +358–9–47175885; fax: +358–9–47175641 E-mail: [email protected]