Worldhealthorganizationtaskfo

World Health Organization multicenter study on menstrual and ovulatory patterns in adolescent girlsII. Longitudinal study of menstrual patterns in the early postmenarcheal period, duration of bleeding episodes and menstrual cycles

Worldhealthorganizationtaskfo, 1986 .

World Health Organization multicenter study on menstrual and ovulatory patterns in adolescent girlsI. A multicenter cross-sectional study of menarche

Worldhealthorganizationtaskfo, 1986 .