The Prader-Willi syndrome was diagnosed in 9-month-old monozygotic twins. The fact that they are concordant monozygotic twins raises the possibility of a genetic cause for the syndrome.
Brissenden JE, Levy EP. Prader-Willi Syndrome in Infant Monozygotic Twins. Am J Dis Child. 1973;126(1):110–112. doi:10.1001/archpedi.1973.02110190098021
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