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Escher, Robert; Kickuth, Ralph; von Steiger, Niklaus; Arnold, Andreas; Dutly, André Emanuel; Haltmeier, Simone; Schiemann, Uwe (2009). A 40-day siege. American journal of medicine, 122(2), pp. 141-3. Orlando, Fla.: Elsevier 10.1016/j.amjmed.2008.10.010