carcinoma (ESCC) risk and the effect modification of other exposures, we conducted a
population‐based case‐control study between 2010 and 2012 in Taixing, China, a high‐risk
area for ESCC. Cases were primarily recruited from endoscopy units at local hospitals,
supplemented by linkage to the local Cancer Registry. Control subjects were frequency
matched to cases by sex and age (5‐year groups) and were randomly selected from the …