<|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, data are available upon request at the department of geriatrics, beijing tiantan hospital, capital medical university, beijing, 100050, china. telephone: +8613911996107; fax: 86-10-67098429; e-mail: ttyyzw@163.com.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>