<|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 available upon request to prof. van der harst. patients did not sign informed consent to release their data on an individual basis on the internet. for this reason, a research proposal should be filled upon contacting prof. van der harst (email address: p.van.der.harst@umcg.nl). provided the research question falls within the limits of the informed consent and there is irb approval the data will be released.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>