Study	Reason for exclusion
Abdalmagid 2012	No relevant outcomes
Afrane 2016	No relevant outcomes
Ansari 2005	No relevant outcomes
Balaraman 1983	No relevant outcomes
Balaraman 1987	No relevant outcomes
Bertram 1950	No relevant outcomes
Bhalwar 1995	No relevant outcomes
Biswas 1997	No relevant outcomes
Bond 2004	No relevant outcomes
Brescia 1947	Study design did not match inclusion criteria
Castro 2002	Study design did not match inclusion criteria
Castro 2009	Intervention did not match inclusion criteria
Chaki 2011	Study design did not match inclusion criteria
Chen 1985	Study design did not match inclusion criteria
Chen 1988	Study design did not match inclusion criteria
Claborn 2002	No relevant outcomes
Derua 2017	No relevant outcomes
Djènontin 2014	No relevant outcomes
El Safi 1986	No relevant outcomes
Farashiani 2000	Full text not available
Fillinger 2003	No relevant outcomes
Galardo 2013	No relevant outcomes
Giurcă 1978	Duplicate but in a different journal
Haq 2004	No relevant outcomes
Houten 1980	Full text not available
Imbahale 2012	Intervention did not match inclusion criteria
Johnson 1947	No relevant outcomes
Julvez 1987a	Study design did not match inclusion criteria
Julvez 1987b	Duplicate but in a different journal
Kanda 1995	Study design did not match inclusion criteria
Karanja 1994	No relevant outcomes
Konradsen 1999	Study design did not match inclusion criteria
Kramer 2014	Protocol
Kumar 1994	Intervention did not match inclusion criteria
Kumar 1998	Intervention did not match inclusion criteria
Kumar 2013	Intervention did not match inclusion criteria
Kusumawathie 2008	No relevant outcomes
Ladoni 1986	Full text not available
Lee 1990	No relevant outcomes
Liu 2009	Study design did not match inclusion criteria
Lunin 1979	No relevant outcomes
Mahdi 1967	No relevant outcomes
Maheu‐Giroux 2013b	No relevant outcomes
Maheu‐Giroux 2013c	Duplicate but in a different journal
Maheu‐Giroux 2014	No relevant outcomes
Marina 2014	No relevant outcomes
McCann 2017a	Protocol
McCann 2017b	Intervention did not match inclusion criteria
Meng 1996	Study design did not match inclusion criteria
Minakawa 2007	Protocol (study not performed)
Mossadegh 1973	Study design did not match inclusion criteria
Msellemu 2016	Study design did not match inclusion criteria
Müller 1984	Study design did not match inclusion criteria
Obopile 2018	Study design did not match inclusion criteria
Ouedraogo 2017	Study design did not match inclusion criteria
Parvez 2003	No relevant outcomes
Perich 1990	No relevant outcomes
Prabhu 2011	No relevant outcomes
Pridantseva 1980	No relevant outcomes
Ranjbar 2012	Study design did not match inclusion criteria
Rettich 1973	Conference abstract
Rifaat 1974	Full text not available
Sharma 1983	No relevant outcomes
Sharma 1989	Intervention did not match inclusion criteria
Sharma 2003	No relevant outcomes
Shililu 2003	No relevant outcomes
Shimada 2007	Study design did not match inclusion criteria
Skovmand 1997	No relevant outcomes
Skovmand 1999	No relevant outcomes
Skovmand 2011	Intervention did not match inclusion criteria
Some 1994	Study design did not match inclusion criteria
Song 2013	Study design did not match inclusion criteria
Srivastava 1996	No relevant outcomes
Tchicaya 2009	No relevant outcomes
Tchicaya 2010	Conference abstract
Teng 2005	No relevant outcomes
Tâcu 1977	Study design did not match inclusion criteria
Usenbaev 2006	Study design did not match inclusion criteria
Vasuki 1992	Study design did not match inclusion criteria
Wang 1983	Study design did not match inclusion criteria
Xu 1980	Study design did not match inclusion criteria
Xu 1983	Study design did not match inclusion criteria
Xu 2004	Study design did not match inclusion criteria
Yapabandara 2002	No relevant outcomes
Yapabandara 2004	Intervention did not match inclusion criteria
Yapabandara 2005	No relevant outcomes
Zhou 2010	Study design did not match inclusion criteria
Zhou 2016	Protocol
Zohdy 1982	Study design did not match inclusion criteria