Table 2.

The response rates

1999 - Admission	n=178
2000 - First year of medical study	n=178
2001 - Second year of medical study	n=129
2002 - Third year of medical study	n=127
2003 - Fourth year of medical study	n=121
2004 - Fifth year of medical study	n=58
2005 - Sixth year of medical study	n=138
2009 - Four year after medical study	n=54