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. 2020 Feb 11;10:2373. doi: 10.1038/s41598-020-58761-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Enrollment, in- and exclusion for analysis of neurologic and motor development at the age of 6 years. In- and exclusion for motor function and intelligence testing in 6 year old children born as VLBWI; *Reasons for not participating the follow-up assessment despite selection were: no current contact data available n = 1349, parents declined invitation for follow-up n = 519, parents were interested to participate but were not available at suggested follow-up dates n = 131, no-show despite arranged follow-up assessment n = 65; **Reasons for no WPPSI assessment included: WPPSI or other cognitive test within 12 months n = 161, language problems n = 24, child not motivated n = 39, serious disorder not related to prematurity (e.g. trisomy 21) n = 7, other reasons n = 10.