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The urgent need to recommend an intake of vitamin D that is effective

Vieth, R.; Bischoff-Ferrari, H.; Boucher, B. J.; Dawson-Hughes, B.; Garland, C. F.; Heaney, R. P.; Holick, M. F.; Hollis, B. W.; Lamberg-Allardt, C.; McGrath, J. J.; Norman, A. W.; Scragg, R.; Whiting, S. J.; Willett, W. C.; Zittermann, A. (2007)