<|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 dataset is part of the northern swedish cohort (nsc) which is not freely accessible, this is because the swedish data protection act (1998:204) does not permit sensitive data on humans (like in the nsc questionnaires) to be openly shared. as such, the data are available upon request from the principal investigator anne hammarström (anne.hammarstrom@umu.se), pending ethical approval.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>