[1] Uniklin Koln, Stabsabt Klin Angelegenheiten & Krisenmanagement, Kerpener Str 62, D-50924 Cologne, Germany
[2] Univ Cologne, Klin & Poliklin Kinder & Jugendmed, Cologne, Germany
[3] Univ Cologne, Klin Anasthesiol & Operat Intens Med, Cologne, Germany
[4] Krankenhaus Porz Rhein, Kinderklin, Cologne, Germany