这些来自瑞士、加拿大和美国的科学家们擅长于人体营养和各种癌症病理，如胃癌和结肠直肠癌。
The scientists, who come from Switzerland, Canada and the US are experts in human nutrition and the pathology of various cancers such as gastrointestinal and colorectal cancer.
多种因素与胃癌的发生相关，如环境、饮食、幽门螺杆菌感染、慢性萎缩性胃炎和肠上皮化生等。
There are well-known risk factors for gastric cancer such as environment, foods, Helicobacter pylori infection of the stomach, chronic atrophic gastritis and intestinal metaplasia.
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