<|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 do not own the raw mortality data underlying this study. all mortality files are available from the compressed mortality files maintained by the national center for health statistics. users have to apply for access to the mortality data. to apply for access, dr. ingram should be contacted: (http://www.cdc.gov/nchs/data_access/cmf.htm#contact).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>