<|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 data used in this study are third-party data. the anonymized data sets of the deas (1996, 2002, 2008, and 2011) are available for secondary analysis. the data has been made available to scientists at universities and research institutes exclusively for scientific purposes. the use of data is subject to written data protection agreements. microdata of the german ageing survey (deas) is available free of charge to scientific researchers for non-profitable purposes. the fdz-dza provides access and support to scholars interested in using deas for their research. however, for reasons of data protection, signing a data distribution contract is required before data can be obtained. please see for further information (data distribution contract): http://www.dza.de/en/fdz/access-to-deas-and-fws-data/formular-deas-en-english.html.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>