[1] Univ Duisburg Essen, Essen, Germany
[2] Univ Childerns Hosp, Heidelberg, Germany
[3] Univ Childerns Hosp, Erlangen, Germany
[4] Endokrinol Hamburg, Hamburg, Germany
[5] Pfizer Pharma GmbH, Karlsruhe, Germany
[6] Univ Childerns Hosp, Tubingen, Germany