<|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: because the data contain personal data and sensitive information, they cannot be made freely available on ethical restriction from karolinska institutet. data requests from any interested researcher must be preceded by an application to the regional ethical board at karolinska institutet in stockholm, sweden (www.epn.se/en/start/application/). please specify the reference number of the ethical approval of the original study: 2009/782-31, 2011/807-32.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>