The article Intake of 25-hydroxyvitamin D3 reduces duration and severity of upper respiratory tract infection: A randomized, double-blind, placebo-controlled, parallel group comparison study, written by Yoshiki Shimizu, Y. Ito, K. Yui, K. Egawa, H. Orimo, was originally published electronically on the publisher’s internet portal (currently SpringerLink) on 21 July 2017 without open access.
With the author(s)’ decision to opt for Open Choice the copyright of the article changed on 21 December 2017 to © The Author(s) 2017 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, 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.
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