Select an exposure and disease. Then use one of the modes of cause and effect to explain the relationship. 

 Select an exposure and disease. Then use one of the modes of cause and effect to explain the relationship. Remember epidemiology is a quantitative discipline. Your answers must use appropriate epidemiological statistics to help describe the association.
Gordis, L. (2014). Epidemiology, 5th edition with STUDENT CONSULT online access. New
York: Elsevier Health Sciences.
Uemura N., Okamoto S, Yamamoto S, et al. (2011). Helicobacter Pylori infection and the
development of gastric cancer. New England Medical Journal 345:784-789.