Study ID	Jadad scale	G A	A C	B A
		Generation of allocation	Allocation concealment	Blinded assessment
Yazici 2004	4	B	B	A
Ross 1993	3	A	A	C
Nystrom 1988	3	B	B	A
Monzani 2004	5	A	A	A
Monzani 2001	5	A	A	A
Meier 2001	4	A	A	A
Kong 2002	4	A	A	A
Jorde 2006	4	B	B	A
Jaeschke 1996	4	A	A	A
Cooper 1984	4	B	B	A
Caraccio 2002	3	A	A	C
Caraccio 2005	5	A	A	A