<|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: the data are patient data. due to ethical restrictions, data are available from the cancer genome atlas (tcga) data portal for researchers who meet the criteria for access to confidential data: https://tcga-data.nci.nih.gov/tcga/.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>