Abenhaim et al20 | + | + | + | + | + | + | + | + | + | + | + | – | – | + | + | + | + | 15 |
Andersson et al21 | + | + | + | + | – | + | + | + | – | – | – | – | – | + | ? | – | + | 9 |
Burdorf et al22 | + | + | + | + | – | + | + | – | + | + | – | – | + | + | – | + | + | 12 |
Butterfield et al23 | + | + | + | – | + | + | + | ? | ? | + | + | – | + | – | + | – | + | 11 |
Fransen et al24 | + | – | + | – | – | + | + | + | – | + | + | + | + | + | + | + | + | 13 |
Gatchel et al25,26 | + | + | + | – | – | + | + | + | – | + | + | + | – | – | + | + | + | 12 |
Gluck et al and Oleinick et al27,28 | + | + | + | + | + | + | + | + | – | + | – | – | – | + | + | – | + | 12 |
Goertz29 | + | – | + | + | – | + | + | ? | – | + | – | – | + | – | – | – | + | 8 |
Hagen and Thune30 | + | – | + | + | ? | + | + | + | ? | + | – | – | + | – | ? | – | + | 9 |
Dasinger et al and Krause et al31,32 | + | – | + | + | + | + | + | – | + | + | + | + | ? | + | + | ? | + | 13 |
Nordin et al33 | + | – | + | ? | ? | + | ? | ? | – | – | + | – | – | + | + | + | + | 8 |
Schultz et al34 | + | + | + | – | – | + | + | + | + | + | + | + | – | – | + | – | – | 11 |
van der Weide et al35,36 | + | – | + | + | + | + | + | + | – | + | + | + | + | + | + | + | – | 14 |
van Doorn37 | + | + | + | +– | + | + | + | – | + | + | + | – | + | + | + | – | + | 14 |