<http://schema.org/about>
"Parents expect young girls to be cleaner than boys, which according to the hygiene hypothesis, might explain why they get sick more often later in life."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/allergies/blogs/mud-is-good-why-women-may-face-a-higher-risk-of-autoimmune-diseases>