| Study | Reason for exclusion |
|---|---|
| Du 1992 | Study did not measure outcomes of interest |
| Lee 2003 | Short term (2 days) |
| Liu 2006 | Control was not minimal |
| Liu 2010 | Not an RCT |
| Oh 2008 | Study did not measure outcomes of interest |
| Park 2014 | Short term (8 weeks) |
| Ritter 2001 | Control was not minimal |
| Stenlund 2009 | Study did not measure outcomes of interest |
| Wei 1996 | Short term (8 weeks) |
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