References used for this fact sheet
- Encyclopaedia Britannica (1997) [multimedia CD-ROM], Encyclopaedia Britannica, USA. More information here.
- The Family Encyclopaedia of Medicine and Health (1997), Dr Maxine Long (cons.), The Book Company, Sydney.
- Lloyd, Dr M. & Gomez, Dr J. (1981), The Complete Illustrated Medical Handbook, New Burlington Books, London, UK.
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