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Siegemund M, Van Bommel J, Sinaasappel M, Schwarte LA, Studer W, Girard T, Vollebregt K, Ince C.Siegemund M, et al.Acta Anaesthesiol Scand. 2007 Jul;51(6):693-700. doi: 10.1111/j.1399-6576.2007.01334.x.Acta Anaesthesiol Scand. 2007.PMID: 17567269
Cnossen JS, Vollebregt KC, de Vrieze N, ter Riet G, Mol BW, Franx A, Khan KS, van der Post JA.Cnossen JS, et al. Among authors: vollebregt kc.BMJ. 2008 May 17;336(7653):1117-20. doi: 10.1136/bmj.39540.522049.BE. Epub 2008 May 14.BMJ. 2008.PMID: 18480117Free PMC article.Review.