<|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: data are available from the aston university research archives and can be accessed by researchers who meet the criteria for access to confidential data. data are available upon request because of ethical restrictions related to confidential clinical information of subjects. readers may send requests to the corresponding author, dr. hetal buckhurst.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>