<|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 is restricted to the chinas under 5 child mortality surveillance system. other researchers could obtain the data by contacting prof. yanping wang (email: wyxyanping@163.com), and get permission from national health and family planning commission of the peoples republic of china. these restrictions have been imposed by the national health and family planning commission of the peoples republic of china.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>