<|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: all relevant data are within the paper and its supporting information files. perinatal characteristics are not supplied due to a small population number, and thereby a risk of individual children being identified. the perinatal characteristics data are not necessary to fully replicate experimentation. perinatal characteristics are behind the statistics in tables 1 and 2 but are not necessary to replicate the experimentation. data are available upon request for researchers who meet the criteria for access to confidential data; please contact ulrika.aden@ki.se.<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>