AU  - Groenwold RH, Donders AT, van der Heijden GG, Hoes AW, Rovers MM
TI  - COnfounding of subgroup analyses in randomized data
PT  - JOUR
DP  - 2009
TA  - Archives of Internal Medicine
pages = {1532-1534},
VI  - 169
IP  - 16
AID  - 10.1001/archinternmed.2009.250 [doi]
4100  - http://dx.doi.org/10.1001/archinternmed.2009.250
SO  - Archives of Internal Medicine September 12, 2009 169(16):1532