<|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: mortality data were obtained through the cdc. data are available via written request through naphsis. the instructions for obtaining data can be found here: http://www.cdc.gov/nchs/data_access/cmf.htm, office of analysis and epidemiology, nchs, room 6219, 3311 toledo rd, hyattsville, md 20782, 301-458-4242, or by email: irosen@cdc.gov.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>