<|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: all underlying data are available upon request. this data is ethically restricted as it may contain identifying patient information. individuals requesting data are welcome to contact the university of pennsylvania institutional review board to arrange secure data transfer as per the policies of the hospital of the university of pennsylvania as they pertain to protected health information.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>