<|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 related to protecting patient confidentiality, all relevant data are available upon request and approval from the karolinska institutet ethics committee. requests may be sent to the principal investigator, dr. clara hellner gumpert (clara.gumpert@ki.se), or to karolinska institutet by e-mail (info@ki.se) or regular mail (karolinska institutet, se-171 77 stockholm, sweden).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>