Study	Author	Year	yi	ni
1	Bohme	2004	-0.4747669	475
2	Kaczmirek	2008	-0.7731938	384
3	Matzatshort	2009	0.03085655	567
4	Matzatlong	2009	-0.5945507	554
5	Conrad1	2010	-0.1240484	2093
6	Conrad2SSI	2010	-0.08587036	324
7	Conrad2AOL	2010	-0.1414549	306