<|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 authors confirm that, for approved reasons, some access restrictions apply to the data underlying the findings. the paper used data from large population cohort studies from many countries. the data are not available in a public repository. access to the data is restricted by the ethical approvals and national legislation of each study. approval of the principal investigator of each cohort study and the morgam management group will be required for release of the data. requests for access to the data should be made to the head of the morgam data centre, kari kuulasmaa (kari.kuulasmaa@thl.fi).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>