20 Chapter 2 Methods Medline was searched for “heart”[MESH] AND “radiation therapy [MESH]” AND “ esophageal cancer [MESH]”, to retrieve papers that published on radiation induced cardiac toxicity and/or radiation dose parameters. Papers publishing data on cardiac toxicity and radiation dose parameters between 1970 and the first of July 2013 were included in this review. References of the articles were screened for other papers and included in this review when considered relevant. Figure 1
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