[1] Univ Childrens Hosp Tubingen, Tubingen, Germany
[2] Univ Tubingen, D-72076 Tubingen, Germany
[3] Univ Tubingen Hosp, Tubingen, Germany
[4] Univ Hosp Regensburg, Regensburg, Germany
[5] Univ Hosp Dresden, Dresden, Germany
[6] Univ Childrens Hosp Heidelberg, Heidelberg, Germany
[7] Haunersches Childrens Hosp Munchen, Munich, Germany
[8] Helmholtz Zentrum Munchen, Munich, Germany
[9] Univ Childrens Hosp Graz, Graz, Austria