<|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: these data, with personal identifiers, were collected to perform public health surveillance on als; data collection was approved for that purpose only. for qualified projects, de-identified data for requested variables are available from the california environmental health tracking program. interested researchers may contact the corresponding author to obtain access.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>