<|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 upon request due to ethical restrictions for researchers who meet the criteria for access to confidential data. data are from the database pheedit (sas institute) at kpe karolinska. requests for data may be submitted to dr. liljefors at the department of oncology, karolinska hospital, 171 76 stockholm, tel +46-8 5177 6136, maria.gustafsson-liljefors@karolinska.se.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>