Table 2.

Excluded studies.

Study	Reason for exclusion
Bird and Bulkeley 2010 [19]	Review paper
Chrzan et al. 2013 [20]	Intervention was not OKC versus CKC
Davis 1996 [21]	Population was not postsurgical
Dolan 2010 [22]	Not an RCT
Fitzgerald 1997 [23]	Not an RCT
Hooper et al. 2002 [24]	Intervention was not OKC versus CKC
Jenkins et al. 1997 [25]	Population was not postsurgical
Keays et al. 2013 [26]	Population was not postsurgical
Laboute et al. 2008 [27]	Intervention was not OKC versus CKC
Lage et al. 1995 [28]	Population was not postsurgical
Mikkelsen et al. 2000 [29]	Intervention was not OKC versus CKC
Neeter et al. 2006 [30]	Intervention was not OKC versus CKC
Perry et al. 2005 [13]	Population was not postsurgical
Petschnig and Baron 1997 [31]	Intervention was not OKC versus CKC
Rennison 1996 [32]	Not an RCT
Ross et al. 2001 [33]	Not an RCT
Tagesson et al. 2008 [34]	Population was not postsurgical