Study	Reason for exclusion
Abitbol 1981	Study not reporting original data
Aguilera 1987	Original studies, not RCT
Amato 1980	Study not reporting original data
Amato 1998	Study not reporting original data
Andrade 1973	Original studies, not RCT, not appropriate study population
Andrade 1992	Original studies, not RCT, not appropriate study population
Apt 1985	Study not reporting original data
Apt 1994	Duplicated data
Apt 2003	Observational study of previous RCT, not appropriate outcomes
Apt 2005	Observational study of previous RCT, not appropriate outcomes
Bestetti 1997	Study not reporting original data
Bocca Tourres 1969	Original studies, not RCT, not appropriate study population
Braga 2000	Original studies, not RCT, not appropriate outcomes
Braga 2006	Original studies, not RCT, not appropriate outcomes
Brener 1975	Study not reporting original data
Cançado 2002	Original studies, not RCT, not appropriate outcomes
Carpintero 1993	Original studies, not RCT
Chippaux 2010	Original studies, not RCT, not appropriate outcomes
Coura 1996	Study not reporting original data
Cutrullis 2007	Not appropriate intervention, study not reporting original data
De Araujo Malta 1993	Study not reporting original data
De Castro 2006	Original studies, not RCT, not appropriate outcomes
De Lana 2009	Original studies, not RCT, not appropriate outcomes
De Oliveira 1967	Original studies, not RCT, not appropriate study population
De Oliveira 1990	Original studies, not RCT
Fabbro 2007	Original studies, not RCT, not appropriate outcomes
Fernandes 2009	Original studies, not RCT, not appropriate outcomes
Fernandez 1969	Original studies, not RCT, not appropriate study population
Fragata Filho 1995	Study not reporting original data
Fragata‐Filho 1995	Data from an abstract. Complete study not published
Gallerano 1990a	Original studies, not RCT
Gallerano 1990b	Original studies, not RCT
Gonnert 1972	Original studies, not RCT
Gutteridge 1976	Study not reporting original data
Ivanovic 1994	Study not reporting original data
Lacunza 2006	Original studies, not RCT, not appropriate outcomes
Levi 1971	Original studies, not RCT
Levi 1996	Study not reporting original data
López‐Antuñaño 1997	Study not reporting original data
Maldonado 1997	Original studies, not RCT
Marr 1986	Study not reporting original data
Martins‐Filho 2002	Original studies, not RCT, not appropriate outcomes
Meirovich 1985	Original studies, not RCT
Mendoza 1992	Study not reporting original data
Prata 1978	Original studies, not RCT
Pérez‐Molina 2009	Study not reporting original data
Rassi 1982	Study not reporting original data
Romeu Cançado 1976	Study not reporting original data
Rubio 1969	Original studies, not RCT
Santana 1969	Study not reporting original data
Silveira 2000	Original studies, not RCT, not appropriate outcomes
Sosa‐Estani 2004	Original studies, not RCT, not appropriate outcomes and treatment
Streiger 2004	Original studies, not RCT, not appropriate outcomes
Viotti 1994	Original studies, not RCT
Wegner 1972a	Original studies, not RCT, not appropriate study population
Wegner 1972b	Original studies, not RCT, not appropriate study population
Zulantay 2005	Original studies, not RCT, not appropriate outcomes

RCT: randomised controlled trial.