T4. Skim the abstract and highlighted passages in Tai et al. (Hot food and beverage consumption and the risk of esophageal squamous cell carcinoma. Medicine. 2017:96:50.) Consider the impact of either HPV infection or fruit/vegetable intake on the association between hot food/beverage intake and esophageal cancer. Do you think the factor you chose is acting as a mediator, a confounder, or a modifier? Provide a brief justification of your choice. (It may be helpful to draw a diagram to help illustrate your point!)