1 Department of Neuroscience, Karolinska Institutet, SE-171 77 Stockholm, Sweden. Electronic address: Kaj.Fried@ki.se.
2 Dept. of Molecular Medicine and Surgery, Clinical Pain Research, Karolinska Institutet, SE-171 76 Stockholm, Sweden; Dept of Pain Management and Research, Oslo University Hospital, Postboks 4950 Nydalen, 0424 Oslo, Norway.