[1] Univ Klinikum Schleswig Holstein, Med Klin 1, D-23538 Lubeck, Germany
[2] Univ Lubeck, Inst Anat, Lubeck, Germany
[3] Univ Klinikum Munster, Klin & Poliklin Kinderheilkunde, Munster, Germany
[4] Univ Plymouth, Peninsula Med Sch, Plymouth PL4 8AA, Devon, England
[5] Univ Exeter, Peninsula Med Sch, Plymouth, Devon, England