Primary amenorrhoea is defined when the time of onset of menstruation is more than 2 years after the average onset of menstruation, i.e. about 12-14 years.
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Secondary absence of menstruation
19-03-2014,Anna Piotrowska Source: J. Kozłowska: Rehabilitacja w ginekologii i położnictwie, AWF 2006, Kraków, pp. 53-54.
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Panthermedia
Flat belly
