<|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 owned by a third party. interested researchers could contact ms. kettlitz (mandy.kettlitz@tk.de) to request the data. in order to fulfill the legal requirements to obtain that kind of data, researchers must obtain a permission for a specific research question from the german federal (social) insurance office. additionally, researchers must conclude a contract with the statutory health insurance regarding data access. moreover, the study has to be approved by the data protection officer both at the statutory health insurance and the research institute as well as the local ethics committee.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>