<|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: this research uses data from addhealth, a program project directed by kathleen mullan harris and designed by j. richard udry, peter s. bearman, and kathleen mullan harris at the university of north carolina at chapel hill. information on how to obtain the addhealth data files is available on the addhealth website (http://www.cpc.unc.edu/addhealth).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>