| Study | Experimental design | Year/Country |
| Belcher, et al. [7] | Descriptive | 2011/United States |
| Budin [8] | Descriptive | 1998/United States |
| Walsh [9] | Descriptive | 2005/United States |
| Lepore et al. [10] | Descriptive | 2008/United States |
| Oudsten et al. [11] | Descriptive | 2009/Holland |
| Zemore, Shepel [12] | Descriptive | 1989/Canada |
| Gellaitry et al. [13] | Randomized controlled clinical trial | 2009/England |
| Makabe, Hull [14] | Descriptive | 2000/United States |
| Alferi et al. [15] | Descriptive | 2001/United States |
| Feigin et al. [16] | Descriptive | 2000/Israel |