1. Cartwright SA. Report on the diseases and physical peculiarities of the negro race. New Orleans Medical and Surgical Journal 1951;7:691–715. [here, p. 707].
2. Rickwood AMK, Walker J. Is phimosis overdiagnosed in boys and are too many circumcision performed in consequence? Annals of the Royal College of Surgeons of England 1989;71:275–7.
3. Breast Cancer rate for 1990:31,364. Prostate Cancer rate for 1990:14,263. Lung Cancer rate for 1990: 29,187. International Agency for Research on Cancer. European Network of Cancer Registries. Cancer in the European Union in 1990. Great Britain. http://www-dep.iarc.fr/dataava/educan9O/ukg.htm
4. Genesis 17:1–14.
5. Hippocrates Aphorisms vi. xix. In: Jones WHS, trans. Hippocrates. Vol. IV. Cambridge: Harvard University Press. 1931:182–5. [Translated here by F.M. Hodges]