Original ArticleWorld Health Organization multicenter study on menstrual and ovulatory patterns in adolescent girls: II. Longitudinal study of menstrual patterns in the early postmenarcheal period, duration of bleeding episodes and menstrual cycles
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Collaborators in the study: H. Campbell, M.D., University of Wales, Cardiff; K. Edström, M.D., WHO Liaison Office with UN, New York; L. Engström, M.D., Centrallasarettet i Mölndal, Sweden; N. Kodagoda, M.D., University of Colombo, Sri Lanka; B. Lunenfeld, M.D., Chaim Sheba Medical Centre, Tel-Hashomer, Israel; M. Romer, BA, WHO, Geneva; P.C. Sizonenko, M.D., University of Geneva, Switzerland; G. Tang, M.D., Queen Mary Hospital, Hong Kong; A. Tserkovnyi, Ph.D., WHO, Geneva.