1. IASP Task Force on Taxonomy. Part III: Pain Terms, A Current List with Definitions and Notes on Usage. In: Merskey H, Bogduk N (eds). Classification of Chronic Pain. Second Edition. Seattle: IASP Press, 1994:209–214.
2. Scherer KR. On the nature and function of emotion: A component process approach. In: Scherer KR, Ekman P (Ed.). Approaches to Emotion Psychology Press, 1984: 293–317.
3. Koyama T, McHaffie JG, Laurienti PJ, Coghill RC. The subjective experience of pain: where expectations become reality. Proc Natl Acad Sci U S A 2005, 102: 12950–12955.
4. Melzack R. Pain and the neuromatrix in the brain. J Dent Educ 2001, 65: 1378–1382.
5. Mallam RA. Cultural influences on the patient’s reaction to anxiety and pain. Ghana Nurse 1966, 3: 4–6.