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Table 2 List of PET studies on which statistical evaluation of PET data was based

1.Adler LJ, Gyulai FE, Diehl DJ, Mintun MA, Winter PM, Firestone LL. Regional brain activity changes associated with fentanyl analgesia elucidated by positron emission tomography. Anesth.Analg. 1997;84:120-126.
2.Andersson JL, Lilja A, Hartvig P, et al. Somatotopic organization along the central sulcus, for pain localization in humans, as revealed by positron emission tomography. Exp.Brain Res. 1997;117:192-199.
3.Aziz Q, Andersson JL, Valind S, et al. Identification of human brain loci processing esophageal sensation using positron emission tomography. Gastroenterology 1997;113:50-59.
4.Casey KL, Minoshima S, Morrow TJ, Koeppe RA. Comparison of human cerebral activation patterns during cutaneous warmth, heat pain, and deep cold pain. J.Neurophysiol. 1996;76:571-581.
5.Coghill RC, Sang CN, Maisog JM, Iadarola MJ. Pain Intensity Processing Within the Human Brain: A Bilateral, Distributed Mechanism. J.Neurophysiol. 1999;82:1934-1943.
6.Coghill RC, Talbot JD, Evans AC, et al. Distributed processing of pain and vibration by the human brain. J.Neurosci. 1994;14:4095-4108.
7.Craig AD, Reiman EM, Evans A, Bushnell MC. Functional imaging of an illusion of pain. Nature 1996;384:258-260.
8.Derbyshire SWG, Jones AK. Cerebral responses to a continual tonic pain stimulus measured using positron emission tomography. Pain 1998;76:127-135.
9.Derbyshire SWG, Jones AK, Gyulai F, Clark S, Townsend D, Firestone LL. Pain processing during three levels of noxious stimulation produces differential patterns of central activity. Pain 1997;73:431-445.
10.Derbyshire SWG, Jones AKP, Devani P, et al. Cerebral responses to pain in patients with atypical facial pain measured by positron emission tomography. J.Neurol.Neurosurg.Psychiatry 1994;57:1166-1172.
11.Derbyshire SWG, Vogt BA, Jones AKP. Pain and Stroop interference tasks activate separate processing modules in anterior cingulate cortex. Exp.Brain Res. 1998;118:52-60.
12.Duncan GH, Kupers RC, Marchand S, Villemure JG, Gybels JM, Bushnell MC. Stimulation of human thalamus for pain relief: possible modulatory circuits revealed by positron emission tomography. J.Neurophysiol. 1998;80:3326-3330.
13.Hsieh JC, Belfrage M, Stoneelander S, Hansson P, Ingvar M. Central representation of chronic ongoing neuropathic pain studied by positron emission tomography. Pain 1995;63:225-236.
14.Hsieh JC, Stahlebackdahl M, Hagermark O, Stoneelander S, RosenQuist G, Ingvar M. Traumatic nociceptive pain activates the hypothalamus and the periaqueductal gray -a positron emission tomography study. Pain 1995;64:303-314.
15.Hsieh JC, Hannerz J, Ingvar M. Right-lateralised central processing for pain of nitroglycerin-induced cluster headache. Pain 1996;67:59-68.
16.Hsieh JC, Stone-Elander S, Ingvar M. Anticipatory coping of pain expressed in the human anterior cingulate cortex: a positron emission tomography study. Neurosci.Lett. 1999;262:61-64.
17.Iadarola MJ, Berman KF, Zeffiro T, et al. Neural activation during acute capsaicin-evoked pain and allodynia assessed with PET. Brain 1998;121:931-947.
18.Jones AKP, Brown WD, Friston KJ, Qi LY, Frackowiak RS. Cortical and subcortical localization of response to pain in man using positron emission tomography. Proc.R.Soc.Lond.B.Biol.Sci. 1991;244:39-44.
19.Jones AKP, Derbyshire SWG. Reduced cortical responses to noxious heat in patients with rheumatoid arthritis. Annals of the Rheumatic Diseases 1997;56:601-607.
20.May A, Bahra A, Buchel C, Frackowiak RS, Goadsby PJ. Hypothalamic activation in cluster headache attacks. Lancet 1998;352:275-278.
21.May A, Kaube H, Büchel C, et al. Experimental cranial pain elicited by capsaicin: a PET study. Pain 1998;74:61-66.
22.Paulson PE, Minoshima S, Morrow TJ, Casey KL. Gender differences in pain perception and patterns of cerebral activation during noxious heat stimulation in humans. Pain 1998;76:223-229.
23.Peyron R, Garcia Larrea L, Gregoire MC, et al. Allodynia after lateral-medullary (Wallenberg) infarct. A PET study. Brain 1998;121:345-356.
24.Peyron R, Garc, Gr, et al. Haemodynamic brain responses to acute pain in humans: Sensory and attentional networks. Brain 1999;122:1765-1780.
25.Rainville P, Duncan GH, Price DD, Carrier B, Bushnell MC. Pain affect encoded in human anterior cingulate but not somatosensory cortex. Science 1997;277:968-971.
26.Rosen SD, Paulesu E, Frith CD, et al. Central nervous pathways mediating angina pectoris. Lancet 1994;344:147-150.
27.Svensson P, Minoshima S, Beydoun A, Morrow TJ, Casey KL. Cerebral processing of acute skin and muscle pain in humans. J.Neurophysiol. 1997;78:450-460.
28.Svensson P, Johannsen P, Jensen TS, et al. Cerebral blood-flow changes evoked by two levels of painful heat stimulation: a positron emission tomography study in humans. Eur.J.Pain 1998;2:95-107.
29.Talbot JD, Marrett S, Evans AC, Meyer E, Bushnell MC, Duncan GH. Multiple representations of pain in human cerebral cortex. Science 1991;251:1355-1358.
30.Tölle TR, Kaufmann T, Siessmeier T, et al. Region-specific encoding of sensory and affective components of pain in the human brain: a positron emission tomography correlation analysis. Ann.Neurol. 1999;45:40-47.
31.Vogt BA, Derbyshire SWG, Jones AK. Pain processing in four regions of human cingulate cortex localized with co-registered PET and MR imaging. Eur.J.Neurosci. 1996;8:1461-1473.