<|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 of the NHDS case study is publicly available at https://www.cdc.gov/nchs/nhds/index.htm. A random subset of this dataset is available as a proxy for testing purposes within the EHRtemporalVariability package, and reproducible examples are available within the package help, its vignette, and the on-line demo. Access to BCH-ASD case study data is restricted by Boston<U+0092>s Children<U+0092>s Institutional Review Board. Access to the Mortality case study data is restricted by the Conselleria de Sanitat Universal i Salut Pública, Generalitat Valenciana, Spain.   https://www.cdc.gov/nchs/nhds/index.htm<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>