Rothman KJ. A sobering start for the cluster busters' conference. Am J Epidemiol. 1990 Jul;132(Suppl 1):6-13.
Rothman KJ, Fyler DC, Goldblatt A, Kreidberg MB. Exogenous hormones and other drug exposures of children with congenital heart-disease. Am J Epidemiol. 1979 Jan 1;109(4):433-9.