<|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: the data are available upon request from the ethical committee of the institute of experimental medicine of czech academy of sciences (head: radim j. sram, md, dsc. sram@biomed.cas.cz; assoc. prof. alexandr chvatal, dsc, mba. chvatal@biomed.cas.cz). since names of volunteers are present in each recording, these data cannot be used for commercial purposes and letter of confidentiality must be signed.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>