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Department of Preventive Medicine, Jeju National University School of Medicine, Jeju, Korea
©2014, Korean Society of Epidemiology
This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Design | Likely | Unlikely |
---|---|---|
Cancer tissues only | [51] (Japan & China) | [53] (Japan) |
[54] (India) | ||
Case-control comparison | [50] (Iran) | [52] (Taiwan) |
Values are presented as [reference number] (nation of subjects).