[1] Univ Freiburg, Fac Med, Dept Mol Embryol, Inst Anat & Cell Biol, Albert Str 17, D-79104 Freiburg, Germany
[2] Furtwangen Univ, Fac Hlth Safety & Soc, Robert Gerwig Platz 1, D-78120 Furtwangen, Germany
[3] Gesundheitsschulen Sudwest GmbH, Konrad Goldmann Str 7, D-79100 Freiburg, Germany
[4] Univ Freiburg, Fac Med, Kompetenzzentrum Evaluat Med, Breisacher Str 153, D-79110 Freiburg, Germany