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Infrequent, irregular episodes of menstrual bleeding usually occurring at intervals of more than 40 days> It has been defined asless than 8 mensual cycles a year or cycles are longer than 35 days
- ↑ Norman RJ, Dewailly D, Legro RS, Hickey TE. Polycystic ovary syndrome. Lancet. 2007 Aug 25; 370(9588):685-97.(Link to article – subscription may be required.)