| Study | Country | Center | Type | Time | Age (year) | BMI (kg/m2) | Surgeon |
| RS/LPS/LT | Bell et al., 2008 | USA | Single | Retrospective cohort | 2000.5-2007.6 | | | S | | | | | | | | | | | | | | | Boggess et al., 2008 | USA | Single | Retrospective cohort | 2005.6-2007.12 | | | NS | | | | | | | | | | | | | | | | | Coronado et al., 2012 | Spain | Single | Retrospective cohort | 2003-2011.6 | | | NS | | | | | | | | | | | | | | | | | Chiou et al., 2015 | Taiwan | Single | Retrospective cohort | 2011-2013 | | | S | | | | | | | | | | | | | | | | | Corrado et al., 2015 | Italy | Single | Retrospective cohort | 2010.8-2013.12 | 64 (35-90) | 28 (17-80) | S | | | | | | 62 (28-86) | 29 (17-59) | | | | | | | 63 (38-88) | 29 (20-42) | | Estape et al., 2012 | USA | Multi | Retrospective cohort | 2002-2009 | | | S | | | | | | | | | | | | | | | | | Jung et al., 2010 | Korea | Single | Prospective cohort | 2006.5-2009.1 | | | NS | | | | | | | | | | | | | | | | | Johnson et al., 2017 | USA | Single | Retrospective cohort | 2008.10-2012.9 | | | | | | | | | | | | | | | | | | | | Manchana et al., 2015 | Thailand | Single | Retrospective cohort | 2011.1-2014.12 | 56 (48-61) | 26.8 (22.7-35.6) | NR | | | | | | 54 (49-62) | 24.4 (21.8-28.3) | | | | | | | 59 (53-65) | 25.4 (22.5-30.2) | | Magrina et al., 2008 | USA | Single | Prospective cohort | 2004.3-2007.12 | | | NR | | | | | | | | | | | | | | | | | Pulman et al., 2017 | Canada | Single | Retrospective cohort | 2005.1-2013.12 | | 30.8 (18.4-51.0) | NS | | | | | | | 26 (20-40) | | | | | | | | 32.6 (20-46.9) | | Shah et al., 2011 | USA | Single | Prospective cohort | 2009.1-2009.12 | | | NR | | | | | | | | | | | | | | | | | RS/LPS | | | | | | | | CG 2010 | USA | Single | Retrospective cohort | 2007.12-2009.7 | | | NS | | | | | | | | | Escobar et al., 2012 | USA | Multi | Retrospective cohort | 2009.4-2010.9 | | | NS | | | | | | | | | Fagotti et al., 2012 | Italy | Multi | Retrospective cohort | 2009.2-2011.6 | 63 (36-85) | 28 (22-25) | NR | | | | | | 58 (37-84) | 27 (17-46) | | Lim et al., 2011 | USA | Single | Prospective cohort | 2008.3-2010.7 | | | S | | | | | | | | | Mäenpää et al., 2016 | Finland | Single | RCT | 2010.11-2013.10 | 67 (43-84) | 29 (20-46) | NS | | | | | | 70 (48-83) | 29 (20-45) | | Seror et al., 2014 | France | Single | Retrospective cohort | 2002.1-2011.12 | | | NS | | | | | | | | | Seamon et al., 2009 | USA | Single | Prospective cohort | 2006.1-2008.4 | | | S | | | | | | | | | Turunen et al., 2013 | Finland | Single | Retrospective cohort | 2009.5-2013.1 | | | S | | | | | | | | | Venkat et al., 2012 | USA | Single | Retrospective cohort | 2008-2010 | | | S | | | | | | | | | RS/LT | | | | | | | | DeNardis et al., 2008 | USA | Single | Retrospective cohort | 2006.7-2007.8 | | | NR | | | | | | | | | ElSahwi et al., 2012 | USA | Single | Retrospective cohort | 2006.9-2010.9 | | | S | | | | | | | | | Eklind et al., 2015 | Sweden | Single | Prospective cohort | 2010.9-2012.12 | 66 (47-87) | 29 (19-46) | S | | | | | | 66 (44-84) | 29 (19-44) | | Goel et al., 2011 | USA | Single | Retrospective cohort | 2006.6-2008.6 | | | S | | | | | | | | | Park et al., 2015 | USA | Single | Retrospective cohort | 2001.1-2012.7 | 60 (24-88) | 30.7 (18.1-66.9) | NS | | | | | | 60 (26-91) | 30.4 (15.6-68.7) | | Mok et al., 2012 | Singapore | Single | Retrospective cohort | 2008.8-2010 | | | NS | | | | | | | | |
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