<|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 for this study are primarily military population and are therefore considered classified information by the changhai hospital, which is affiliated with the second military medical university. no data may therefore be shared in any form.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>