<|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. interested researchers must be approved by the irb of huashan hospital. thus, to request the data, please contact dr. cuiyun wu, secretary of irb, huashan hospital, fudan university. email: hskyc@fudan.edu.cn.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>