[1] Klinikum Oldenburg, Zentrum Kinder & Jugendmed, Klin Allgemeine Kinderheilkunde, D-26133 Oldenburg, Germany
[2] Univ Klinikum Schleswig Holstein, Inst Pathol, Sekt Kinderpathol, Lubeck, Germany
[3] Klinikum Oldenburg, Klin Kinderchirurg, D-26133 Oldenburg, Germany
[4] Klinikum Oldenburg, Klin Allgemein & Visceralchirurg, D-26133 Oldenburg, Germany
[5] Univ Munich, Kinderchirurg Klin & Poliklin, D-80539 Munich, Germany