[1] Univ Heidelberg, Childrens Hosp, D-6900 Heidelberg, Germany
[2] Univ Heidelberg, Inst Med Microbiol & Hyg, Heidelberg, Germany
[3] Univ Cologne, Dept Pharmacol, Cologne, Germany
[4] Univ Cologne, Dept Radiol, Cologne, Germany
[5] Johannes Gutenberg Univ Mainz, Dept Med 3, Mainz, Germany
[6] Univ Cologne, Clin Trials Ctr Cologne, Cologne, Germany
[7] Univ Cologne, Dept Internal Med 1, Cologne, Germany