Table 1.

Reference	Year	Country	Study type	Number
Weber et al. [9]	2002	USA	Case series	2
Hashizume et al. [10]	2002	Japan	Case series	3
Talamini et al. [11]	2002	USA	Case series	18
Vibert et al. [12]	2003	France	Case series	3
Delaney et al. [13]	2003	USA	Comparative	6
Giulianotti et al. [14]	2003	Italy	Case series	16
Hubens et al. [15]	2004	Belgice	Case series	8
Anvari et al. [16]	2004	Canada	Prospective Comparative	10
D'Annibale [17]	2004	Italy	Comparative	53
Braumann et al. [18]	2005	Germany	Case series	5
Woeste et al. [19]	2005	Germany	Comparative	6
Bonder et al. [20]	2005	Austria	Case series	14
Ruurda et al. [21]	2005	Holland	Case series	23
Pigazzi et al. [22]	2006	USA	Comparative	6
Sebajang et al. [23]	2006	Canada	Case series	7
DeNoto et al. [24]	2006	USA	Case series	11
Heemskerk et al. [25]	2007	Netherlands	Comparative	19
Hellan et al. [26]	2007	USA	Case series	37
Rawlings et al. [27]	2007	USA	Comparative	30
Baik et al. [28]	2008	Korea	Randomized trial	18
Spinoglio [28]	2008	Italy	Comparative	50
Huettner et al. [29]	2008	USA	Case series	70
Soravia et al. [30]	2008	Switzerland	Case series	40
Baik et al. [31]	2009	Korea	Comparative	56
Choi et al. [32]	2009	Korea	Case series	50
DeHoog et al. [33]	2009	Netherlands	Case control	20
Luca et al. [34]	2009	Italy	Case series	55
Park [34]	2009	Korea	Case series	45
Ng et al. [35]	2009	Singapore	Case series	8
Tsoraides et al. [36]	2010	USA	Retrospective	102
Baek et al. [37]	2010	Korea	Retrospective	64
Kim and kang [38]	2010	Korea	Comparative	100
Bianchi et al. [39]	2010	Italy	Comparative	56
Bokhari et al. [40]	2010	USA	Case series	50
Pernazza and Morpurgo [41]	2010	Italy	Case series	50
DeSouza et al. [42]	2010	USA	Case control	40
Zimmern et al. [43]	2010	USA	Case series	131
Popescu et al. [44]	2010	Romania	Comparative	122
Park et al. [45]	2010	Korea	Comparative	41
Haas et al. [46]	2011	USA	Comparative	32
Kang and kim [47]	2011	Korea	Retrospective	204
41				1681