<|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 underlying the findings in this study are from an impact evaluation study of the sustainable action against hiv and aids in communities. the data cannot be made available in the manuscript, the supplemental files, or a public repository due to the ethical restriction stated in the application for ethical approval from the national ethics committee for health research. however, all data are available upon request from dr. siyan yi at siyan@doctor.com.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>