Table 2.

Quality assessment of studies included [12–17]

Study	Randomisation	Allocated concealment	Blinding	Withdrawal/lost to follow-up (%)
Court-Brown et al. (1996) [15]	Adequate	Unclear	Unclear	0
Blachut et al. (1997) [16]	Adequate	Unclear	Unclear	0
Keating et al. (1997) [17]	Adequate	Unclear	Unclear	6
Nassif et al. (2000) [18]	Adequate	Unclear	Unclear	0
Larsen et al. (2004) [19]	Adequate	Unclear	Unclear	5
Bhandari et al. (2008) [20]	Adequate	Adequate	Adequate	7