<|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 protecting patients' privacy. the ethics committee of the sun yat-sen memorial hospital can be reached at the following telephone number: 86-020-81332371. readers can also contact the corresponding author (wenjun wang, e-mail:wenjungzcn@163.com) to request data from the ethics committee.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>