<|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: all data underlying the authors' findings in this study are freely available in a public repository, regulated by the national center for health statistics (nchs). the authors have obtained individual county-level characteristic data from nchs for their analyses, thus its public use is restricted. readers that are interested in requesting this data may contact robert anderson md, mph, chief of the mortality statistics at nchs, by email at rnanderson@cdc.gov.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>