<|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: the authors confirm that, for approved reasons, some access restrictions apply to the data underlying the findings. the macs study data is maintained by the center for the analysis of macs data (camacs). a de-identified, freely available public dataset is available at http://www.statepi.jhsph.edu/macs/pdt.html. to protect confidentiality of the macs participants, this data is highly de-identified and does not contain all variables used for the current analysis. for example, data in the public dataset may be grouped into categories rather than continuous variables, and dates are changed to years. individuals interested in obtaining additional data should submit a data request to lisa jacobson (ljacobs1@jhu.edu).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>