<|begin_of_text|><|start_header_id|>system<|end_header_id|>

You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: due to ethical considerations, data are available from the ethics committee of the national institute of nutrition and food safety, chinese centers for disease control and prevention (beijing, china) for researchers who meet the criteria for access to confidential data. alternatively, researchers may contact dr. xiaoguang yang to request the data, which will be available upon request to all interested researchers.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>