1. World Health Organization. Oral contraceptives and neoplasia. WHO Technical Report Series 817. Report of a WHO Scientific Group, 1992.
2. World Health Organization. New estimates in maternal mortality. WHO Weekly Epidemiological Record 47. 1991;345–8.
3. World Health Organization. Women, Health and Development. Progress Report by the Director General to the 44th World Health Assembly. WHO Document A44/15, 1991.
4. Population Reports, Series A;Population Information Program,1988
5. Vessey M, Metcalfe A, Wells C, McPherson K, Westoff C, Yeates D. Ovarian neoplasma functional ovarian cysts, and oral contraceptives. Br Med J. 1987;294:1518–20.