134 Chapter 5 Table 2 - Assessment of risk of bias Author Year Newcastle Ottawa Scale (NOS) Selection (0-4) Comparability (0-2) Outcome (0-3) Total (0-9) Stollman 2008 *** * *** 7 Ibrahim 2012 *** - ** 5 Festen 2002 ** ** ** 6 Escobar 2005 *** - *** 6 Dariel 2015 *** * *** 7 Demirogullari 2011 ** - ** 4 Bianchi 1998 *** - *** 6 Teitelbaum 1998 ** - *** 5 Santos 1999 *** - *** 6 Saxena 2001 *** * *** 7 Önen 2003 *** - ** 5 Escobar 2004 *** * ** 6 Sauer 2005 ** ** ** 6 Chiu 2006 *** * ** 6 Lee 2006 ** * *** 6 Banieghbal 2007 ** - *** 5 Henrich 2007 *** - * 4 Payne 2010 **** * *** 8 Takahashi 2010 *** * ** 6 de Vos 2011 *** - *** 6 Kozlov 2010 *** ** ** 7 Orion 2011 *** - ** 5 Li 2012 *** - ** 5 Weil 2011 *** * *** 7 Ghaffarpour 2013 *** * ** 6 Jensen 2013 *** ** ** 7 Diao 2014 ** * *** 6 Friedmacher 2014 *** ** *** 8 Yang 2014 ** - ** 4 Madadi-Sanjani 2015 *** ** ** 7 Almosallam 2016 *** - ** 5 Diao 2016 ** - ** 4 Jiang 2016 ** - ** 4 Tullie 2016 *** * *** 7 Dingemann 2017 *** - *** 7 Tyson 2017 *** * ** 6 van den Eijnden 2017 *** * *** 7
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