<|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: due to ethical restrictions imposed by the ethics committee for this study, the data cannot be deposited in the public domain. data are available upon request, pending ethical approval. requests can be made to (mathias.steinach@charite.de).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>