From: Faecal blood loss with aspirin, nonsteroidal anti-inflammatory drugs and cyclo-oxygenase-2 selective inhibitors: systematic review of randomized trials using autologous chromium-labelled erythrocytes
Decade
Quality score
Total
1
2
3
4
5
1960s
1970s
9
1980s
11
7
26
1990s
8
2000s
21
6
15
47