<|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: because of an ethical restriction, all data underlying the findings in this study are freely available upon request only. if readers require access to the data, please send an e-mail to the corresponding author, dr. jinsoo chung (cjs5225@ncc.re.kr), as all information of the enrolled patients is stored in an institutional database that is strictly regulated, under the guidance of the authors' institutional review board.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>