| Study | Reason for exclusion |
|---|---|
| Brega Massone 2003 | Case control study |
| Gagarine 2003 | Case control study |
| Grunenwald 1989 | Case control study |
| Gundogdu 2006 | Non‐randomized comparative study |
| Ito 2003 | Non‐randomized comparative study |
| Izbiki 1994 | Animal case series |
| Kiaergard 2000 | Randomized animal study |
| Kobayashi 2001 | Non‐randomized comparative study in rats |
| Massone 2002 | Case control study |
| Matsumura 2004 | Non‐randomized comparative study |
| McCarthy 1988 | Randomized animal study |
| Miyamoto 2003 | Clinical case series |
| Nomori 2000 | Non‐randomized comparative study |
| Omote 1994 | Non‐randomized comparative study |
| Potaris 2003 | Case control study |
| Ranger 1997 | Randomized animal study |
| Sabanathan 1993 | Clinical case series |
| Ueda 2007 | Case control study |
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