General practitioners' awareness of colorectal cancer: a 10 year review.

women, cohorts born 1891-1945. Soc Biol 1974;21: 178-84. 16 McFalls JA, McFalls WH. Diseases and fertility. New York: Academic Press, 1984. 17 Belsey MA. The epidemiology of infertility: a review with particular reference to sub-Saharan Africa. Bull WHO 1976;54:319-41. 18 Sherris JD, Fox G. Infertility and sexually transmitted disease: a public health challenge. Popul Rep 1983;XI: 1 13-51. 19 Duncan JM. Fecundity, fertility, and sterility. Edinburgh: A and C Black, 1866. 20 Rachootin P, Olsen J. Prevalence and socioeconomic correlates of subfecundity and spontaneous abortion in Denmark. IntJf Epidemiol 1982;11: 245-9. 21 Fraser RC, Clayton DC. The accuracy of age/sex registers, practice medical records and family practitioner committee registers. 7 R Coll Gen Pract 1981;31:410. 22 Young CM. The role of medical factors in the failure to achieve desired family size.JBiosocSci 1979;11:159-71. 23 Mosher WD. Infertility trends among United States couples: 1%5-1976. Fam Plann Perspect 1982;14(1):22-7. 24 Porter M. Infertility: the extent of the problem. Biology and Society 1984;1: 128-35. 25 Miller JF, Williamson E, Glue J. Fetal loss after implantation: a prospective study. Lancet 1980;i:554-6. 26 Pittaway DE, Vernon C, Fayex JA. Spontaneous abortions in women with endometriosis. Fertil Steril 1988;50:7 11-5. 27 Jensen PS. Spontaneous abortion incidence in the treatment of infertility. AmJf Obstet Gynecol 1982;143:451-73. 28 Templeton AA. Female infertility and pelvic infection. In: MacLean AB, ed. Clinical infection in obstetrics and gynaecology. Oxford: Blackwell Scientific Publications (in press). 29 Westrom L. Incidence, prevalence, and trends of acute pelvic inflammatory disease and its consequences in industrialised countries. Am.7 Obstet Gynecol 1980;180:880-92. 30 Aral SO, Holmes KK. Epidemiology of sexually transmitted diseases. In: Holmes KK, Mardh PA, Sparling PF, Wiesner PH, eds. Sexually transmitted diseases. New York: McGraw Hill, 1984:127-41. 31 Westrom L, Bengtsson L, Mardh PA. Incidence, trends, and risk of ectopic pregnancy in a population of women. BrMedJ7 198 1;282:15-8. 32 Rubin GL, Peterson HB, Dorfman SF, et al. Ectopic pregnancy in the United States 1970 through 1978. JAMA 1978;249:1715-29. 33 Flett GMM, Urquhart DR, Fraser C, Terry PB, Fleming JC. Ectopic pregnancy in Aberdeen 1950-1985. Br_ Obstet Gynaecol 1988;95:740-6. 34 Bemstein D, Levin S, Amsterdam E, Insler V. Is conception in infertile couples treatment-related? A survey of 309 pregnancies. Int J Fertil 1979;24:65-7. 35 Collins JA, Wrixon W, Janes LB, Wilson EH. Treatment-independent pregnancy among infertile couples. N Englj Med 1983;309:1201-6.