Study Year of
publication		 Random
sequence
generation		 Allocation
concealment		 Blinding of
participants
and personnel		 Blinding of
outcome
assessment		 Incomplete
outcome data
addressed		 Selective
reporting
Sexton et al. [2] 2011 low risk low risk low risk low risk low risk low risk
da Costa et al. [3] 2015 low risk low risk low risk low risk low risk low risk
Frodge et al. [4] 2008 low risk low risk low risk low risk low risk low risk
Rosa et al. [7] 2014 low risk unclear risk unclear risk unclear risk unclear risk low risk
Ma et al. [13] 2015 low risk low risk low risk low risk low risk low risk
Zhu et al. [14] 2015 low risk low risk low risk low risk low risk low risk
Oh et al. [15] 2015 low risk low risk low risk low risk low risk low risk
Miller et al. [16] 2006 low risk low risk low risk low risk low risk low risk
Ng et al. [17] 2007 low risk low risk low risk low risk low risk low risk
Scannapieco et al. [18] 2007 low risk low risk low risk low risk low risk low risk
Reinhardt et al. [19] 2010 low risk low risk low risk low risk low risk low risk
Noh et al. [20] 2013 low risk low risk low risk low risk low risk low risk
Kato et al. [21] 2014 low risk low risk low risk low risk low risk low risk
Liao et al. [22] 2014 low risk unclear risk unclear risk low risk low risk low risk
Singh et al. [23] 2014 low risk low risk low risk low risk low risk low risk