Table 1 Characteristics of the trials

Phase

  I/II

7

  II

6

  IV

1

  Not specified

5

Clinical areas

  Cancer

6

  Internal medicine

6

  Orthopedics

5

  Others

2

Participating centers

  KUH only

17

  Multicenter study

2

Study start date

  2004 to 2005

3

  2006 to 2007

10

  2008 to 2009

3

  2010

3

Target sample size per year per center^a

  0 to 9

6

  10 to 19

6

  20 to 29

2

  30 to 39

1

  ≥40

4

Enrolled patients per year per center

  0 to 9

10

  10 to 19

3

  20 to 29

1

  30 to 39

4

  ≥40

1