<|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 confirm that all data underlying the findings are fully available without restriction. a hard copy of the data is available from appendix d of the following book: fleming, t. r. and harrington, d. p. (1991) counting processes and survival analysis. wiley: new york. pbc data is available online with the r package pbc {survival}. requests for the authors r code may be sent to the corresponding author.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>