<|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: data are available from the center for disease control and prevention and are freely available and open access. these can be obtained directly via the cdc nhanes dedicated webpages. the main page is http://www.cdc.gov/nchs/nhanes.htm which gives direct access to the data and all the data catalogues and information.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>