<|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 due to ethical restrictions, approved by the ethics committee of the rwth aachen university to the forschungszentrum jülich. data and results presented in this paper are available upon request via the corresponding author: prof. n. jon shah.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>