| 1 | University of FRANKFURT(1995-1996) |
| 2 | University of MAGDEBURG(1999-2000) |
| 3 | HARVARD University(2002) |
| 4 | BETH ISRAEL DEACONESS Medicine Center(2003) |
| 5 | University of MAGDEBURG(2004) |
| 6 | OTTO VON GUERICKE University(2005) |
| 7 | University of MAGDEBURG(2006-2009) |
| 8 | University of OTTAWA(2010-2020) |