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Wiberg-Itzel E, Lipponer C, Norman M, Herbst A, Prebensen D, Hansson A, Bryngelsson AL, Christoffersson M, Sennström M, Wennerholm UB, Nordström L.Wiberg-Itzel E, et al. Among authors: nordstrom l.BMJ. 2008 Jun 7;336(7656):1284-7. doi: 10.1136/bmj.39553.406991.25. Epub 2008 May 25.BMJ. 2008.PMID: 18503103Free PMC article.Clinical Trial.