<|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: data are from the nurses' health study ii, and are governed by irb restrictions. the nurses' health study ii maintains an nih-approved data sharing policy through the data enclave approach. external researchers can access data by following the steps listed on our website (http://www.channing.harvard.edu/nhs/?page_id=471). manuscript authors may also be contacted with questions about accessing the data at jwrichedwards@bics.bwh.harvard.edu (janet rich-edwards) or nhidv@channing.harvard.edu (immaculata devivo).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>