<|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 cannot be made publicly available by the authors, because they were obtained from the third party nhanes. the authors used data from two nhanes waves in this study: 2001-2002 and 2003-2004. datasets can be found in the two folders, questionnaire and dietary. these datasets are freely available at the following urls: http://wwwn.cdc.gov/nchs/nhanes/search/nhanes01_02.aspx; http://wwwn.cdc.gov/nchs/nhanes/search/nhanes03_04.aspx.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>