Daily progestogen for contraception: a clinical study.

Dean, J. G., Brit. med. Y., 1949, 1, 842. ' Market Research Africa (Pty.) Ltd. study on birthplace and overseas travel of the White South African population, Johannesburg (1963) and subsequent studies. ' Allison, R. S., and Millar, J. H. D., Ulster med. Y., 1954, 23, Suppl. No. 2. 'McAlpine, D., Lumsden, C. E., and Acheson, E. D., Multiple Sclerosis: A Reappraisal. 1965. Edinburgh. Hargreaves, E. R., Proc. roy. Soc. Med., 1961, 54, 209. 'Pratt, R. T. C., Compston, N. D., and McAlpine, D., Brain, 1951, 74, 191. Dassel, H., Acta psychiat. scand., 1960, 35, Suppl. No. 147, p. 64. Registrar-General's Decennial Supplement, England and Wales (1951). Occupational Mortality. Part 11, Vol. 1, Commentary p. 33. H.M.S.O., London. Miller, H., Ridley, A., and Schapira, K., Brit. med. 7., 1960, 2, 343. ° Beebe, G. W., Kurtzke, J. F., Kurland, L. T., Auth, T. L., and Nagler, B., American Academy of Neurology meeting. 1966. " Hyllested, K., Disseminated Sclerosis in Denmark. Prevalence and Geographical Distribution. 1956. Copenhagen. " Acheson, E. D., and Bachrach, C. A., Amer. 7. Hyg., 1960, 72, 88. is Swank, R. L., Lerstad, O., Strom, A., and Backer, J., New Engl. 7. Med., 1952, 246, 721. 14 Wright, K. B., Viviers, G. J., Proctor, N. S. F., Kauffman, J. C. E., and Bruning, E. G. H., S. Afr. med. 7., 1965, 39, 386. Thomson, J. G., and Ames, F. R., ibid., 1965, 39, 389. 6 Cochrane, J., ibid., 1947, 21, 613. Kramer, S., Lipschitz, R., and Schwartz, M. B., ibid., 1956, 30, 829. 8 Reef, H., Lipschitz, R., and Block, J., Med. Proc., 1958, 4, 292. '9 Alter, M., Halpern, L., Kurland, L. T Bornstein, B., Leibowitz, U., and Silberstein, J., Arch. Neurol. (Chic.), 1962, 7, 253. 20 Kurland, L. T., Amer. 7. Hyg., 1952, 55, 457. 21 Westlund, K. B., and Kurland, L. T., ibid., 1953, 57, 380. 2 Sutherland, J. M., Tyrer, J. H., and Eadie, M. J., Brain, 1962, 85, 149. 23 Saint, E. G., and Sadka, M., Med. 7. Aust., 1962, 2, 249. 24 Rischbieth, R. H., ibid., 1966, 1, 774. 25 Okinaka, S., et al., Wld Neurol., 1960, 1, 22. 26 Barlow, J. S., Acta psychiat. Scand., 1960, 35, Suppl. No. 147, p. 108. 2' Swank, R. L., A Biochemical Basis of. Multiple Sclerosis. 1961. Springfield, Illinois. Campbell, A. M. G., Daniel, P., Porter, R. J., Russell, W. R., Smith, H. V., and Innes, J. R. M., Brain, 1947, 70, 50. 29 Dean, J. G., S. Afr. med. 7., 1965, 39, Suppl. July. so Poskanzer, D. C., Schapira, K., and Miller, H., Lancet, 1963, 2, 917. 31 Gear, J. H. S., Wld Hlth Org. Monogr. Ser., 1955, No. 26, p. 31. 22 Eadie, M. J., Sutherland, J. M., and Tyrer, J. H., Brit. med. 7., 1965, 1, 1471. 23 Kurtze, J. F., ibid., 1965, 2, 1308. S4 Dean, J. G., S. Afr. med. 7., 1967, 41, 294. 32 Stamp, J. T., Vet. Rec., 1962, 74, 357. 3 Gaidusek, D. C., Gibbs, C. J., jun., and Alpers, M., Nature (Lond.), 1966, 209, 794. 3 'Mackay, I. R., and Burnet, F. Macfarlane. Auto-immune Diseases. Pathogenesis, Chemistry and Therapy. 1963. Springfield, IllinoiL