<|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: the authors confirm that, for approved reasons, some access restrictions apply to the data underlying the findings. all relevant data are within the paper. the surveillance data are available at tianjin cdc disease surveillance database. due to the ethical restrictions of tianjin cdc ethical committee, these data cannot be made publically available, in order to protect the confidentiality of the study subjects' private information. however, researchers who meet the criteria for access to confidential data can contact dr. xiexiu wang at wjsttigo@126.com.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>