<|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: our retrospective study was conducted based on population-based data from the cancer registry group, tri-service general hospital. data are available upon request from the authors because of the strict ethical restrictions imposed by our institutional review board (irb). however, we have provided all of the relevant data of this study and confirmed that the relevant data were within the paper.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>