<|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 subject to national data protection laws and only available upon formal request. the responsible contact person is dr. burkhard haastert, responsible biostatistican of the project group, medistatistica, 58809 neuenrade, and associate researcher at the department of public health, faculty of medicine, heinrich-heine university düsseldorf, germany, who needs to be contacted at haastert@medistatistica.de.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>