What is the fine-grained topic of the following text: Children living in U.S. cities are far more likely to have food allergies than those living in rural areas, according to a large study led by Dr. Ruchi Gupta, an allergist and assistant professor of pediatrics at Northwestern University’s Feinberg School of Medicine in Chicago. Only return the topic.
Prevalence of food allergies in children in U.S. urban versus rural areas.