<|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 data are available upon request because of the ancillary study policy of the 3c group. the three city study steering committee has imposed to all researchers outside the research center a limited access to the data. each researcher has to present the objective of the research and the data needed in a brief report which is examined by the steering committee. when the proposal is accepted, the database access is granted for 6 months. the procedure to get agreement on the transmission of data and materials is described in the website: http://www.three-city-study.com/ancillary-studies.php<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>