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Published online by Cambridge University Press: 01 August 2014
In 1970 Hungary has joined in the WHO twin research program, and the medical file of twins has thus become compulsory.
A total of 269 twin pairs could thus be examined at the age of 6 months, 157 at the age of 12 months, and 44 at the age of 24 months. They all came from the same population and included 54 pairs diagnosed as MZ and 109 diagnosed as DZ. Extensive dental examination is planned to take place yearly till the age of 14 years.