Hay cientos de estudios científicos, por ejemplo.
Serum testosterone levels in healthy young black and white men - PubMed
Blacks in the United States have the highest prostate cancer rate in the world and nearly twice that of whites in the United States. The 2:1 black-to-white ratio in prostate cancer rates is already apparent at age 45 years, the age at which the earliest prostate cancer cases occur. This finding...
pubmed.ncbi.nlm.nih.gov
Últimamente se considera racista hacer este tipo de estudios.
