Study	Reason for exclusion
Alfaleh 2008	Wrong outcomes
Barrington 1986	Commentary
Cotts 2009	Wrong patient population
Domanico 1994	Abstract only
Gregoire 2004	Wrong outcomes
Gutierrez 1987	Abstract only
Hammerman 1986	Wrong patient population
Hammerman 2005	Commentary
Harma 2018	Wrong outcomes
Kääpä 1985	Wrong patient population
Liebowitz 2017	Wrong study design
Mahony 1982	Wrong patient population
McGuire 2002	commentary
Meau‐Petit 2005	Conference abstract of included study
Ment 1987	Conference abstract of included study
Ment 1998	Commentary
Ment 1999	Wrong outcomes
Morales‐Suarez 1992	Conference abstract of included study
Naulaers 2005	Wrong outcomes
Pleacher 2004	Wrong outcomes
Puckett 1985	Abstract only
Roze 2003	Conference abstract of included study
Rubaltelli 1998	Wrong comparator
Schmidt 2002	commentary
Schmidt 2011	Wrong comparator
Tyson 2002	Commentary
Valls‐i‐Soler 1999	Wrong comparator
van Overmeire 2002	Conference abstract of included study
Varvarigou 1996	Wrong study design
Vohr 1999	Wrong outcomes
Zarkesh 2013	Abstract only