<|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 from the author because of the strict ethical restrictions imposed by our institutional review board (irb). the irb of severance hospital requires researchers to keep data because of confidential issues which is based on personal information protection laws. readers may request the data from dongbeom song and the severance hospital institutional review board.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>