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The Anyang Esophageal Cancer Cohort Study: Study Design, Implementation of Fieldwork, and Use of Computer-Aided Survey System

Figure 3

Flow diagram of participants.

This figure illustrates the flow diagram of participants through enrollment, serum screening and endoscopic examination in the baseline investigation of Anyang Esophageal Cancer Cohort Study, Anyang, China, 2006–2009.

Figure 3

doi: https://doi.org/10.1371/journal.pone.0031602.g003