Table 1.
Studies included in the metaanalysis
| Reference, Year Published | Study Years | Country | Recipients | Pregnancies | |
|---|---|---|---|---|---|
| 1 | Devresse et al., 2017 [32] | 1994–2010 | Belgium | 32 | 57 |
| 2 | Yuksel et al., 2017 [33] | 2009–2016 | Turkey | 25 | na |
| 3 | Ajaimy et al., 2016 [34] | 2009–2014 | USA | 11 | 11 |
| 4 | Candido et al., 2016 [35] | 2004–2014 | Portugal | 36 | 53 |
| 5 | Cristelli et al., 2016 [36] | 2004–2014 | Brazil | 36 | 53 |
| 6 | El Houssni et al., 2016 [37] | na | Saudi Arabia | 12 | 21 |
| 7 | Lima et al., 2016 [38] | 2004–2014 | Brazil | 36 | 53 |
| 8 | Majak et al., 2016 [39] | 1969–2013 | Norway | na | 119 |
| 9 | Mishra et al., 2016 [40] | 2004–2014 | India | 16 | na |
| 10 | Orihuela et al., 2016 [41] | 1986–2014 | Uruguay | 32 | 40 |
| 11 | Piccoli et al., 2016 [42] | 1978–2013 | Italy | na | 189 |
| 12 | Saliem et al., 2016 [43] | 2006–2011 | Canada | na | 264 |
| 13 | Santos et al., 2016 [44] | 2010–2014 | Portugal | 8 | 8 |
| 14 | Sarween et al., 2016 [45] | 2001–2015 | UK | 387 | 569 |
| 15 | Stoumpos et al., 2016 [46] | 1973–2013 | UK | 89 | 138 |
| 16 | Yoshikawa et al., 2016 [47] | na | Japan | 49 | 65 |
| 17 | Aktrurk et al., 2015 [48] | 2004–2014 | Turkey | 12 | 16 |
| 18 | Arab et al., 2015 [49] | 2003–2010 | Canada | na | 375 |
| 19 | Erman et al., 2015 [50] | 1987–2011 | Turkey | 43 | 43 |
| 20 | Yeon et al., 2015 [51] | 1995–2015 | Korea | 84 | 119 |
| 21 | Debska – Slizien et al., 2014 [52] | 1980–2012 | Poland | 17 | 22 |
| 22 | Farr et al., 2014 [53] | 1999–2013 | Austria | 12 | 12 |
| 23 | Hebral et al., 2014 [54] | 1969–2011 | France | 46 | 61 |
| 24 | You et al., 2014 [55] | 1995–2013 | Korea | 29 | 41 |
| 25 | Blume et al., 2013 [56] | 1988–2010 | Germany | 34 | 53 |
| 26 | Guella et al., 2013 [57] | 1992–2008 | Saudi Arabia | 15 | 33 |
| 27 | Pietrzak et al., 2013 [58] | 2001–2012 | Poland | 34 | 40 |
| 28 | Rachdi et al., 2013 [59] | 2003–2013 | Tunisia | 12 | 17 |
| 29 | Ribeiro et al., 2013 [60] | 1995–2007 | Brazil | 22 | 31 |
| 30 | Rocha et al., 2013 [61] | 1983–2009 | Portugal | 24 | 25 |
| 31 | Wyld et al., 2013 [62] | 1971–2010 | Australia | 447 | 692 |
| 32 | Kennedy et al., 2012 [63] | na | Ireland | 18 | 29 |
| 33 | Neyatani et al., 2012 [64] | 1975–2011 | Japan | 22 | 34 |
| 34 | Van Buren et al., 2012 [65] | 1971–2010 | Netherlands | 30 | 42 |
| 35 | Celik et al., 2011 [66] | 1998–2008 | Turkey | 24 | 31 |
| 36 | Gerlei et al., 2011 [67] | 1974–2010 | Hungary | 23 | 27 |
| 37 | Lopez et al., 2011 [68] | 1986–2010 | Spain | 20 | 24 |
| 38 | Xu et al., 2011 [69] | 1989–2008 | China | 25 | 38 |
| 39 | Gorgulu et al., 2010 [70] | 1983–2008 | Turkey | 19 | 22 |
| 40 | Areia et al., 2009 [71] | 1989–2007 | Portugal | 28 | 34 |
| 41 | Gill et al., 2009 [20] | 1990–2003 | USA | 483 | 530 |
| 42 | Levidiotis et al., 2009 [8] | 1966–2005 | Australia | 381 | 577 |
| 43 | Rizvi et al., 2009 [72] | 1985–2008 | Pakistan | 45 | 72 |
| 44 | Sharma et al., 2009 [73] | 1988–2006 | Oman | 42 | 82 |
| 45 | Al Duraihimh et al., 2008 [74] | 1996–2006 | Middle East | 140 | 234 |
| 46 | Alfi A Yet al, 2008 [75] | 1989–2005 | Saudi Arabia | 12 | 20 |
| 47 | Cruz Lemini et al., 2007 [28] | 1990–2005 | Mexico | 60 | 75 |
| 48 | Oliveira et al., 2007 [76] | 2001–2005 | Brazil | 52 | 52 |
| 49 | Sibanda et al., 2007 [77] | 1994–2001 | UK | 176 | 193 |
| 50 | Yassaee et al., 2007 [78] | 1996–2001 | Iran | 74 | 95 |
| 51 | Kurata et al., 2006 [79] | 1984–2003 | Japan | 42 | 53 |
| 52 | Rahamimov et al., 2006 [80] | 1983–1998 | Israel | 39 | 69 |
| 53 | Galdo et al., 2005 [81] | 1982–2002 | Chile | 30 | 37 |
| 54 | Garcia - Donaire et al., 2005 [82] | 1997–2004 | Spain | 16 | 19 |
| 55 | Ghanem et al., 2005 [83] | 1989–2004 | Egypt | 41 | 67 |
| 56 | Pour-Reza-Gholi et al., 2005 [84] | 1984–2004 | Iran | 60 | 74 |
| 57 | Yildirim et al., 2005 [85] | 1998–2005 | Turkey | 17 | 20 |
| 58 | Keitel et al., 2004 [86] | 1977–2001 | Brazil | 41 | 44 |
| 59 | Pezeshki et al., 2004 [87] | 1991–1998 | Iran | 18 | 20 |
| 60 | Hooi et al., 2003 [88] | 1984–2001 | Malaysia | 46 | 72 |
| 61 | Queipo et al., 2003 [89] | 1980–2000 | Spain | 29 | 40 |
| 62 | Thompson et al., 2003 [90] | 1976–2001 | UK | 24 | 48 |
| 63 | Sgro et a,l 2002 [91] | 1988–1998 | Canada | 26 | 44 |
| 64 | Tan et al., 2002 [92] | 1986–2000 | Singapore | 25 | 42 |
| 65 | Park et al., 2001 [93] | na - 2000 | South Korea | 36 | 47 |
| 66 | Kuvacic et al., 2000 [94] | 1986–1996 | Croatia | 15 | 23 |
| 67 | Little et al., 2000 [27] | 1985–1998 | Ireland | 19 | 29 |
| 68 | Moon et al., 2000 [95] | na - 1998 | Korea | 36 | 48 |
| 69 | Ventura et al., 2000 [96] | 1983–1999 | Portugal | 15 | 15 |
| 70 | Arsan et al., 1997 [97] | na | France | 20 | 33 |
| 71 | Rahbar et al., 1997 [98] | 1985–1993 | Iran | 13 | 14 |
| 72 | Rieu et al., 1997 [99] | 1970–1995 | France | 22 | 33 |
| 73 | Al Hassani et al., 1995 [100] | 1985–1993 | Oman | 25 | 44 |
| 74 | Sabagh et al., 1995 [101] | 1984–1994 | Saudi Arabia | 33 | 52 |
| 75 | Saber et al., 1995 [102] | 1968–1992 | Brazil | 19 | 25 |
| 76 | Wong et al., 1995 [103] | 1972–1992 | New Zealand | 9 | 16 |
| 77 | Hadi et al., 1986 [104] | 1969–1992 | South Korea | 11 | 13 |
| 78 | Talaat et al., 1994 [105] | 1977–1992 | Sweden | 19 | 25 |
| 79 | Pahl et al., 1993 [106] | 1969–1990 | USA | 21 | 32 |
| 80 | Muirhead et al., 1992 [107] | 1977–1988 | UK | 22 | 22 |
| 81 | Brown et al., 1991 [108] | 1965–1989 | Ireland | 14 | 27 |
| 82 | Sturgiss et al., 1991 [109] | 1967–1987 | UK | 17 | 22 |
| 83 | O’ Connell et al., 1989 [110] | 1974–1986 | Australia | 11 | 18 |
| 84 | Ha et al., 1994 [111] | 1970–1982 | USA | 13 | 17 |
| 85 | Marushak et al., 1986 [112] | 1972–1983 | Denmark | 20 | 24 |
| 86 | O’ Donnell et al., 1985 [113] | 1971–1984 | South Africa | 21 | 38 |
| 87 | Waltzer et al., 1980 [114] | na | USA | 12 | 15 |
na not available