<|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 are from the ontario pancreas cancer study and the ontario cancer risk factor study, however data are not freely available due to ethical restrictions. data may be available upon request from steven gallinger (sgallinger@rogers.com) or michelle cotterchio (michelle.cotterchio@cancercare.on.ca).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>