<|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 used in this manuscript are from the national tuberculosis epidemiological survey sponsored by the chinese ministry of health. ethical restrictions prevent public sharing of data. data are available upon request. interested readers may contact the author, cheng jun, at chengjun@chinatb.org.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>